diff --git a/src/langs/zh_CN.json b/src/langs/zh_CN.json
index a3213d2..6b2c70d 100644
--- a/src/langs/zh_CN.json
+++ b/src/langs/zh_CN.json
@@ -120,6 +120,11 @@
     "Changes to the settings take effect after refreshing page.": "设置将在页面刷新后生效.",
     "Type is illegal!": "类型错误!",
     "Parameter is invalid!": "请求参数无效",
+    "Option value cannot be empty!": "参数内容不能为空!",
+    "Input number is invalid!": "输入的数字无效!",
+    "Input number is below min value!": "输入的数字小于最小值 {{value}} !",
+    "Input number is above max value!": "输入的数字大于最大值 {{value}} !",
+    "Input value is invalid!": "输入的内容无效!",
     "format": {
         "longdate": "YYYY年MM月DD日 HH:mm:ss",
         "time.millisecond": "{{value}} 毫秒",
diff --git a/src/scripts/config/aria2Options.js b/src/scripts/config/aria2Options.js
index 4029267..29fc515 100644
--- a/src/scripts/config/aria2Options.js
+++ b/src/scripts/config/aria2Options.js
@@ -1,22 +1,41 @@
 (function () {
     'use strict';
     angular.module('ariaNg').constant('aria2AllOptions', {
+        // EXAMPLE:
+        // 'option name': {
+        //     type: 'string|integer|float|text|boolean|option',
+        //     [suffix: 'Bytes|Milliseconds|Seconds|Minutes|Hours',]
+        //     [defaultValue: '',]
+        //     [readonly: true|false,] //default: false
+        //     [split: '',] //SUPPORT 'text' type
+        //     [showCount: true|false,] //SUPPORT 'text' type, parameter 'split' is required, default: false
+        //     [options: [],] //SUPPORT 'option' type
+        //     [min: 0,] //SUPPORT 'integer', 'float'
+        //     [max: 0,] //SUPPORT 'integer', 'float'
+        //     [pattern: '']
+        // }
         'dir': {
-            type: 'string'
+            type: 'string',
+            required: true
         },
         'log': {
-            type: 'string'
+            type: 'string',
+            required: true
         },
         'max-concurrent-downloads': {
             type: 'integer',
-            defaultValue: '5'
+            defaultValue: '5',
+            required: true,
+            min: 1
         },
         'check-integrity': {
             type: 'boolean',
-            defaultValue: 'false'
+            defaultValue: 'false',
+            required: true
         },
         'continue': {
-            type: 'boolean'
+            type: 'boolean',
+            required: true
         },
         'all-proxy': {
             type: 'string'
@@ -30,33 +49,48 @@
         'connect-timeout': {
             type: 'integer',
             suffix: 'Seconds',
-            defaultValue: '60'
+            defaultValue: '60',
+            required: true,
+            min: 1,
+            max: 600
         },
         'dry-run': {
             type: 'boolean',
-            defaultValue: 'false'
+            defaultValue: 'false',
+            required: true
         },
         'lowest-speed-limit': {
             type: 'string',
             suffix: 'Bytes',
-            defaultValue: '0'
+            defaultValue: '0',
+            required: true,
+            pattern: '^(0|[1-9]\\d*(K|M)?)$'
         },
         'max-connection-per-server': {
             type: 'integer',
-            defaultValue: '1'
+            defaultValue: '1',
+            required: true,
+            min: 1,
+            max: 16
         },
         'max-file-not-found': {
             type: 'integer',
-            defaultValue: '0'
+            defaultValue: '0',
+            required: true,
+            min: 0
         },
         'max-tries': {
             type: 'integer',
-            defaultValue: '5'
+            defaultValue: '5',
+            required: true,
+            min: 0
         },
         'min-split-size': {
             type: 'string',
             suffix: 'Bytes',
-            defaultValue: '20M'
+            defaultValue: '20M',
+            required: true,
+            pattern: '^(0|[1-9]\\d*(K|M)?)$'
         },
         'netrc-path': {
             type: 'string',
@@ -64,7 +98,8 @@
             defaultValue: '$(HOME)/.netrc'
         },
         'no-netrc': {
-            type: 'boolean'
+            type: 'boolean',
+            required: true
         },
         'no-proxy': {
             type: 'text',
@@ -74,20 +109,26 @@
         'proxy-method': {
             type: 'option',
             options: ['get', 'tunnel'],
-            defaultValue: 'get'
+            defaultValue: 'get',
+            required: true
         },
         'remote-time': {
             type: 'boolean',
-            defaultValue: 'false'
+            defaultValue: 'false',
+            required: true
         },
         'reuse-uri': {
             type: 'boolean',
-            defaultValue: 'true'
+            defaultValue: 'true',
+            required: true
         },
         'retry-wait': {
             type: 'integer',
             suffix: 'Seconds',
-            defaultValue: '0'
+            defaultValue: '0',
+            required: true,
+            min: 0,
+            max: 600
         },
         'server-stat-of': {
             type: 'string'
@@ -100,22 +141,29 @@
         },
         'split': {
             type: 'integer',
-            defaultValue: '5'
+            defaultValue: '5',
+            required: true,
+            min: 1
         },
         'stream-piece-selector': {
             type: 'option',
             options: ['default', 'inorder', 'random', 'geom'],
-            defaultValue: 'default'
+            defaultValue: 'default',
+            required: true
         },
         'timeout': {
             type: 'integer',
             suffix: 'Seconds',
-            defaultValue: '60'
+            defaultValue: '60',
+            required: true,
+            min: 1,
+            max: 600
         },
         'uri-selector': {
             type: 'option',
             options: ['inorder', 'feedback', 'adaptive'],
-            defaultValue: 'feedback'
+            defaultValue: 'feedback',
+            required: true
         },
         'check-certificate': {
             type: 'boolean',
@@ -124,15 +172,18 @@
         },
         'http-accept-gzip': {
             type: 'boolean',
-            defaultValue: 'false'
+            defaultValue: 'false',
+            required: true
         },
         'http-auth-challenge': {
             type: 'boolean',
-            defaultValue: 'false'
+            defaultValue: 'false',
+            required: true
         },
         'http-no-cache': {
             type: 'boolean',
-            defaultValue: 'false'
+            defaultValue: 'false',
+            required: true
         },
         'http-user': {
             type: 'string'
@@ -163,11 +214,13 @@
         },
         'enable-http-keep-alive': {
             type: 'boolean',
-            defaultValue: 'true'
+            defaultValue: 'true',
+            required: true
         },
         'enable-http-pipelining': {
             type: 'boolean',
-            defaultValue: 'false'
+            defaultValue: 'false',
+            required: true
         },
         'header': {
             type: 'string'
@@ -177,7 +230,8 @@
         },
         'use-head': {
             type: 'boolean',
-            defaultValue: 'false'
+            defaultValue: 'false',
+            required: true
         },
         'user-agent': {
             type: 'string',
@@ -193,7 +247,8 @@
         },
         'ftp-pasv': {
             type: 'boolean',
-            defaultValue: 'true'
+            defaultValue: 'true',
+            required: true
         },
         'ftp-proxy': {
             type: 'string'
@@ -207,11 +262,13 @@
         'ftp-type': {
             type: 'option',
             options: ['binary', 'ascii'],
-            defaultValue: 'binary'
+            defaultValue: 'binary',
+            required: true
         },
         'ftp-reuse-connection': {
             type: 'boolean',
-            defaultValue: 'true'
+            defaultValue: 'true',
+            required: true
         },
         'ssh-host-key-md': {
             type: 'string'
@@ -227,11 +284,13 @@
         },
         'bt-enable-hook-after-hash-check': {
             type: 'boolean',
-            defaultValue: 'true'
+            defaultValue: 'true',
+            required: true
         },
         'bt-enable-lpd': {
             type: 'boolean',
-            defaultValue: 'false'
+            defaultValue: 'false',
+            required: true
         },
         'bt-exclude-tracker': {
             type: 'text',
@@ -243,57 +302,73 @@
         },
         'bt-force-encryption': {
             type: 'boolean',
-            defaultValue: 'false'
+            defaultValue: 'false',
+            required: true
         },
         'bt-hash-check-seed': {
             type: 'boolean',
-            defaultValue: 'true'
+            defaultValue: 'true',
+            required: true
         },
         'bt-max-open-files': {
             type: 'integer',
-            defaultValue: '100'
+            defaultValue: '100',
+            required: true,
+            min: 1
         },
         'bt-max-peers': {
             type: 'integer',
-            defaultValue: '55'
+            defaultValue: '55',
+            required: true,
+            min: 0
         },
         'bt-metadata-only': {
             type: 'boolean',
-            defaultValue: 'false'
+            defaultValue: 'false',
+            required: true
         },
         'bt-min-crypto-level': {
             type: 'option',
             options: ['plain', 'arc4'],
-            defaultValue: 'plain'
+            defaultValue: 'plain',
+            required: true
         },
         'bt-prioritize-piece': {
             type: 'string'
         },
         'bt-remove-unselected-file': {
             type: 'boolean',
-            defaultValue: 'false'
+            defaultValue: 'false',
+            required: true
         },
         'bt-require-crypto': {
             type: 'boolean',
-            defaultValue: 'false'
+            defaultValue: 'false',
+            required: true
         },
         'bt-request-peer-speed-limit': {
             type: 'string',
             suffix: 'Bytes',
-            defaultValue: '50K'
+            defaultValue: '50K',
+            required: true,
+            pattern: '^(0|[1-9]\\d*(K|M)?)$'
         },
         'bt-save-metadata': {
             type: 'boolean',
-            defaultValue: 'false'
+            defaultValue: 'false',
+            required: true
         },
         'bt-seed-unverified': {
             type: 'boolean',
-            defaultValue: 'false'
+            defaultValue: 'false',
+            required: true
         },
         'bt-stop-timeout': {
             type: 'integer',
             suffix: 'Seconds',
-            defaultValue: '0'
+            defaultValue: '0',
+            required: true,
+            min: 0
         },
         'bt-tracker': {
             type: 'text',
@@ -303,17 +378,25 @@
         'bt-tracker-connect-timeout': {
             type: 'integer',
             suffix: 'Seconds',
-            defaultValue: '60'
+            defaultValue: '60',
+            required: true,
+            min: 1,
+            max: 600
         },
         'bt-tracker-interval': {
             type: 'integer',
             suffix: 'Seconds',
-            defaultValue: '0'
+            defaultValue: '0',
+            required: true,
+            min: 0
         },
         'bt-tracker-timeout': {
             type: 'integer',
             suffix: 'Seconds',
-            defaultValue: '60'
+            defaultValue: '60',
+            required: true,
+            min: 1,
+            max: 600
         },
         'dht-file-path': {
             type: 'string',
@@ -326,7 +409,7 @@
             defaultValue: '$HOME/.aria2/dht6.dat'
         },
         'dht-listen-port': {
-            type: 'integer',
+            type: 'string',
             readonly: true,
             defaultValue: '6881-6999'
         },
@@ -347,12 +430,14 @@
         },
         'enable-peer-exchange': {
             type: 'boolean',
-            defaultValue: 'true'
+            defaultValue: 'true',
+            required: true
         },
         'follow-torrent': {
             type: 'option',
             options: ['true', 'false', 'mem'],
-            defaultValue: 'true'
+            defaultValue: 'true',
+            required: true
         },
         'listen-port': {
             type: 'integer',
@@ -362,12 +447,16 @@
         'max-overall-upload-limit': {
             type: 'string',
             suffix: 'Bytes',
-            defaultValue: '0'
+            defaultValue: '0',
+            required: true,
+            pattern: '^(0|[1-9]\\d*(K|M)?)$'
         },
         'max-upload-limit': {
             type: 'string',
             suffix: 'Bytes',
-            defaultValue: '0'
+            defaultValue: '0',
+            required: true,
+            pattern: '^(0|[1-9]\\d*(K|M)?)$'
         },
         'peer-id-prefix': {
             type: 'string',
@@ -376,16 +465,21 @@
         },
         'seed-ratio': {
             type: 'float',
-            defaultValue: '1.0'
+            defaultValue: '1.0',
+            required: true,
+            min: 0
         },
         'seed-time': {
             type: 'integer',
-            suffix: 'Minutes'
+            suffix: 'Minutes',
+            required: true,
+            min: 0
         },
         'follow-metalink': {
             type: 'option',
             options: ['true', 'false', 'mem'],
-            defaultValue: 'true'
+            defaultValue: 'true',
+            required: true
         },
         'metalink-base-uri': {
             type: 'string'
@@ -405,11 +499,13 @@
         'metalink-preferred-protocol': {
             type: 'option',
             options: ['http', 'https', 'ftp', 'none'],
-            defaultValue: 'none'
+            defaultValue: 'none',
+            required: true
         },
         'metalink-enable-unique-protocol': {
             type: 'boolean',
-            defaultValue: 'true'
+            defaultValue: 'true',
+            required: true
         },
         'enable-rpc': {
             type: 'boolean',
@@ -418,7 +514,8 @@
         },
         'pause-metadata': {
             type: 'boolean',
-            defaultValue: 'false'
+            defaultValue: 'false',
+            required: true
         },
         'rpc-allow-origin-all': {
             type: 'boolean',
@@ -443,7 +540,8 @@
         },
         'rpc-save-upload-metadata': {
             type: 'boolean',
-            defaultValue: 'false'
+            defaultValue: 'false',
+            required: true
         },
         'rpc-secure': {
             type: 'boolean',
@@ -451,23 +549,28 @@
         },
         'allow-overwrite': {
             type: 'boolean',
-            defaultValue: 'false'
+            defaultValue: 'false',
+            required: true
         },
         'allow-piece-length-change': {
             type: 'boolean',
-            defaultValue: 'false'
+            defaultValue: 'false',
+            required: true
         },
         'always-resume': {
             type: 'boolean',
-            defaultValue: 'true'
+            defaultValue: 'true',
+            required: true
         },
         'async-dns': {
             type: 'boolean',
-            defaultValue: 'true'
+            defaultValue: 'true',
+            required: true
         },
         'auto-file-renaming': {
             type: 'boolean',
-            defaultValue: 'true'
+            defaultValue: 'true',
+            required: true
         },
         'auto-save-interval': {
             type: 'integer',
@@ -477,7 +580,8 @@
         },
         'conditional-get': {
             type: 'boolean',
-            defaultValue: 'false'
+            defaultValue: 'false',
+            required: true
         },
         'conf-path': {
             type: 'string',
@@ -514,7 +618,8 @@
         'download-result': {
             type: 'option',
             options: ['default', 'full', 'hide'],
-            defaultValue: 'default'
+            defaultValue: 'default',
+            required: true
         },
         'dscp': {
             type: 'string',
@@ -531,7 +636,8 @@
         },
         'enable-mmap': {
             type: 'boolean',
-            defaultValue: 'false'
+            defaultValue: 'false',
+            required: true
         },
         'event-poll': {
             type: 'option',
@@ -541,15 +647,18 @@
         'file-allocation': {
             type: 'option',
             options: ['none', 'prealloc', 'trunc', 'falloc'],
-            defaultValue: 'prealloc'
+            defaultValue: 'prealloc',
+            required: true
         },
         'force-save': {
             type: 'boolean',
-            defaultValue: 'false'
+            defaultValue: 'false',
+            required: true
         },
         'hash-check-only': {
             type: 'boolean',
-            defaultValue: 'false'
+            defaultValue: 'false',
+            required: true
         },
         'human-readable': {
             type: 'boolean',
@@ -558,16 +667,22 @@
         },
         'max-download-result': {
             type: 'integer',
-            defaultValue: '1000'
+            defaultValue: '1000',
+            required: true,
+            min: 0
         },
         'max-mmap-limit': {
             type: 'string',
             suffix: 'Bytes',
-            defaultValue: '9223372036854775807'
+            defaultValue: '9223372036854775807',
+            required: true,
+            pattern: '^(0|[1-9]\\d*(K|M)?)$'
         },
         'max-resume-failure-tries': {
             type: 'integer',
-            defaultValue: '0'
+            defaultValue: '0',
+            required: true,
+            min: 0
         },
         'min-tls-version': {
             type: 'option',
@@ -578,15 +693,19 @@
         'log-level': {
             type: 'option',
             options: ['debug', 'info', 'notice', 'warn', 'error'],
-            defaultValue: 'debug'
+            defaultValue: 'debug',
+            required: true
         },
         'optimize-concurrent-downloads': {
             type: 'string',
             defaultValue: 'false'
         },
         'piece-length': {
-            type: 'integer',
-            defaultValue: '1M'
+            type: 'string',
+            suffix: 'Bytes',
+            defaultValue: '1M',
+            required: true,
+            pattern: '^(0|[1-9]\\d*M?)$'
         },
         'show-console-readout': {
             type: 'boolean',
@@ -602,12 +721,16 @@
         'max-overall-download-limit': {
             type: 'string',
             suffix: 'Bytes',
-            defaultValue: '0'
+            defaultValue: '0',
+            required: true,
+            pattern: '^(0|[1-9]\\d*(K|M)?)$'
         },
         'max-download-limit': {
             type: 'string',
             suffix: 'Bytes',
-            defaultValue: '0'
+            defaultValue: '0',
+            required: true,
+            pattern: '^(0|[1-9]\\d*(K|M)?)$'
         },
         'no-conf': {
             type: 'boolean',
@@ -616,11 +739,14 @@
         'no-file-allocation-limit': {
             type: 'string',
             suffix: 'Bytes',
-            defaultValue: '5M'
+            defaultValue: '5M',
+            required: true,
+            pattern: '^(0|[1-9]\\d*(K|M)?)$'
         },
         'parameterized-uri': {
             type: 'boolean',
-            defaultValue: 'false'
+            defaultValue: 'false',
+            required: true
         },
         'quiet': {
             type: 'boolean',
@@ -629,10 +755,12 @@
         },
         'realtime-chunk-checksum': {
             type: 'boolean',
-            defaultValue: 'true'
+            defaultValue: 'true',
+            required: true
         },
         'remove-control-file': {
-            type: 'boolean'
+            type: 'boolean',
+            required: true
         },
         'save-session': {
             type: 'string'
diff --git a/src/scripts/config/constants.js b/src/scripts/config/constants.js
index efa5520..2887565 100644
--- a/src/scripts/config/constants.js
+++ b/src/scripts/config/constants.js
@@ -7,7 +7,8 @@
         optionStorageKey: 'Options',
         globalStatStorageCapacity: 120,
         taskStatStorageCapacity: 300,
-        lazySaveTimeout: 500
+        lazySaveTimeout: 500,
+        errorTooltipDelay: 200
     }).constant('ariaNgDefaultOptions', {
         language: 'en',
         rpcHost: '',
diff --git a/src/scripts/config/defaultLanguage.js b/src/scripts/config/defaultLanguage.js
index 06f930a..2f93681 100644
--- a/src/scripts/config/defaultLanguage.js
+++ b/src/scripts/config/defaultLanguage.js
@@ -124,6 +124,11 @@
             'Changes to the settings take effect after refreshing page.': 'Changes to the settings take effect after refreshing page.',
             'Type is illegal!': 'Type is illegal!',
             'Parameter is invalid!': 'Parameter is invalid!',
+            'Option value cannot be empty!': 'Option value cannot be empty!',
+            'Input number is invalid!': 'Input number is invalid!',
+            'Input number is below min value!': 'Input number is below min value {{value}}!',
+            'Input number is above max value!': 'Input number is above max value {{value}}!',
+            'Input value is invalid!': 'Input value is invalid!',
             'format': {
                 'longdate': 'MM/DD/YYYY HH:mm:ss',
                 'time.millisecond': '{{value}} Millisecond',
diff --git a/src/scripts/directives/setting.js b/src/scripts/directives/setting.js
index 44c7b7d..0f21d6b 100644
--- a/src/scripts/directives/setting.js
+++ b/src/scripts/directives/setting.js
@@ -1,7 +1,7 @@
 (function () {
     'use strict';
 
-    angular.module('ariaNg').directive('ngSetting', ['$timeout', 'ariaNgConstants', function ($timeout, ariaNgConstants) {
+    angular.module('ariaNg').directive('ngSetting', ['$timeout', '$translate', 'ariaNgConstants', function ($timeout, $translate, ariaNgConstants) {
         return {
             restrict: 'E',
             templateUrl: 'views/setting.html',
@@ -16,26 +16,26 @@
             link: function (scope, element, attrs, ngModel) {
                 var pendingSaveRequest = null;
                 var options = {
-                    lazySaveTimeout: ariaNgConstants.lazySaveTimeout
+                    lazySaveTimeout: ariaNgConstants.lazySaveTimeout,
+                    errorTooltipDelay: ariaNgConstants.errorTooltipDelay
                 };
 
                 angular.extend(options, attrs);
 
-                scope.optionStatus = (function () {
-                    var value = 'ready';
+                var destroyTooltip = function () {
+                    angular.element(element).tooltip('destroy');
+                };
 
-                    var destroyTooltip = function () {
-                        angular.element(element).tooltip('destroy');
-                    };
-
-                    var showTooltip = function (cause, type) {
-                        if (!cause) {
-                            return;
-                        }
+                var showTooltip = function (cause, type, causeParams) {
+                    if (!cause) {
+                        return;
+                    }
 
+                    $timeout(function () {
                         angular.element(element).tooltip({
-                            title: cause,
+                            title: $translate.instant(cause, causeParams),
                             trigger: 'focus',
+                            placement: 'auto top',
                             container: element,
                             template:
                             '<div class="tooltip' + (type ? ' tooltip-' + type : '') + '" role="tooltip">' +
@@ -43,7 +43,11 @@
                                 '<div class="tooltip-inner"></div>' +
                             '</div>'
                         }).tooltip('show');
-                    };
+                    }, options.errorTooltipDelay);
+                };
+
+                scope.optionStatus = (function () {
+                    var value = 'ready';
 
                     return {
                         getValue: function () {
@@ -70,10 +74,10 @@
                             value = 'failed';
                             showTooltip(cause, 'warning');
                         },
-                        setError: function (cause) {
+                        setError: function (cause, causeParams) {
                             destroyTooltip();
                             value = 'error';
-                            showTooltip(cause, 'error');
+                            showTooltip(cause, 'error', causeParams);
                         },
                         getStatusFeedbackStyle: function () {
                             if (value == 'success') {
@@ -116,6 +120,10 @@
                 };
 
                 scope.changeValue = function (optionValue, lazySave) {
+                    if (pendingSaveRequest) {
+                        $timeout.cancel(pendingSaveRequest);
+                    }
+
                     scope.optionValue = optionValue;
                     scope.optionStatus.setReady();
 
@@ -123,16 +131,52 @@
                         return;
                     }
 
+                    if (scope.option.required && optionValue == '') {
+                        scope.optionStatus.setError('Option value cannot be empty!');
+                        return;
+                    }
+
+                    if (scope.option.type == 'integer' && !/^-?\d+$/.test(optionValue)) {
+                        scope.optionStatus.setError('Input number is invalid!');
+                        return;
+                    }
+
+                    if (scope.option.type == 'float' && !/^-?(\d*\.)?\d+$/.test(optionValue)) {
+                        scope.optionStatus.setError('Input number is invalid!');
+                        return;
+                    }
+
+                    if ((scope.option.type == 'integer' || scope.option.type == 'float') && (!angular.isUndefined(scope.option.min) || !angular.isUndefined(scope.option.max))) {
+                        var number = optionValue;
+
+                        if (scope.option.type == 'integer') {
+                            number = parseInt(optionValue);
+                        } else if (scope.option.type == 'float') {
+                            number = parseFloat(optionValue);
+                        }
+
+                        if (!angular.isUndefined(scope.option.min) && number < scope.option.min) {
+                            scope.optionStatus.setError('Input number is below min value!', { value: scope.option.min });
+                            return;
+                        }
+
+                        if (!angular.isUndefined(scope.option.max) && number > scope.option.max) {
+                            scope.optionStatus.setError('Input number is above max value!', { value: scope.option.max });
+                            return;
+                        }
+                    }
+
+                    if (!angular.isUndefined(scope.option.pattern) && !(new RegExp(scope.option.pattern).test(optionValue))) {
+                        scope.optionStatus.setError('Input value is invalid!');
+                        return;
+                    }
+
                     var data = {
                         key: scope.option.key,
                         value: optionValue,
                         optionStatus: scope.optionStatus
                     };
 
-                    if (pendingSaveRequest) {
-                        $timeout.cancel(pendingSaveRequest);
-                    }
-
                     var invokeChange = function () {
                         scope.optionStatus.setSaving();
                         scope.onChangeValue(data);