diff --git a/common/at.js b/common/at.js
index 17dd5f48c4..ec37f7b852 100644
--- a/common/at.js
+++ b/common/at.js
@@ -20,7 +20,7 @@ var _ = require('lodash');
  * @return {Array} 用户名数组
  */
 var fetchUsers = function (text) {
-  var ignore_regexs = [
+  var ignoreRegexs = [
     /```.+?```/g, // 去除单行的 ```
     /^```[\s\S]+?^```/gm, // ``` 里面的是 pre 标签内容
     /`[\s\S]+?`/g, // 同一行中，`some code` 中内容也不该被解析
@@ -29,11 +29,10 @@ var fetchUsers = function (text) {
     /\[@.+?\]\(\/.+?\)/g, // 已经被 link 的 username
   ];
 
-  ignore_regexs.forEach(function(ignore_regex) {
+  ignoreRegexs.forEach(function (ignore_regex) {
     text = text.replace(ignore_regex, '');
   });
 
-
   var results = text.match(/@[a-z0-9\-_]+\b/igm);
   var names = [];
   if (results) {
@@ -44,6 +43,7 @@ var fetchUsers = function (text) {
       names.push(s);
     }
   }
+  names = _.uniq(names);
   return names;
 };
 exports.fetchUsers = fetchUsers;
diff --git a/test/common/at.test.js b/test/common/at.test.js
index 256a4409c4..1dd7d4a7c9 100644
--- a/test/common/at.test.js
+++ b/test/common/at.test.js
@@ -68,9 +68,17 @@ describe('test/common/at.test.js', function () {
     ```
 
     [@be_link](/user/be_link) [@be_link2](/user/be_link2)
+
+    @alsotang @alsotang
+    aldjf
+    @alsotang @tangzhanli
   */});
 
-  var matched_users = ['A-aZ-z0-9_', 'begin_with_spaces', 'multi_in_oneline', 'around_text', 'end_with_no_space', 'begin_with_no_spaces', 'end_with_no_space2', 'begin_with_no_spaces2', 'alsotang', 'alsotang2'];
+  var matched_users = ['A-aZ-z0-9_', 'begin_with_spaces',
+    'multi_in_oneline', 'around_text', 'end_with_no_space',
+    'begin_with_no_spaces', 'end_with_no_space2',
+    'begin_with_no_spaces2', 'alsotang', 'alsotang2',
+    'tangzhanli'];
 
   var linkedText = multiline.stripIndent(function(){/*
 [@A-aZ-z0-9_](/user/A-aZ-z0-9_)
@@ -115,6 +123,10 @@ code: `@in_code`
 ```
 
 [@be_link](/user/be_link) [@be_link2](/user/be_link2)
+
+[@alsotang](/user/alsotang) [@alsotang](/user/alsotang)
+aldjf
+[@alsotang](/user/alsotang) [@tangzhanli](/user/tangzhanli)
   */});
 
   describe('#fetchUsers()', function () {