diff --git a/src/browser/index.jsx b/src/browser/index.jsx
index 481ccdd7..5528d797 100644
--- a/src/browser/index.jsx
+++ b/src/browser/index.jsx
@@ -50,22 +50,31 @@ var MainPage = React.createClass({
     });
     this.handleOnTeamFocused(key);
   },
-  handleUnreadCountChange: function(index, unreadCount, mentionCount) {
+  handleUnreadCountChange: function(index, unreadCount, mentionCount, isUnread, isMentioned) {
     var unreadCounts = this.state.unreadCounts;
     var mentionCounts = this.state.mentionCounts;
+    var unreadAtActive = this.state.unreadAtActive;
+    var mentionAtActive = this.state.mentionAtActive;
     unreadCounts[index] = unreadCount;
     mentionCounts[index] = mentionCount;
+    // Never turn on the unreadAtActive flag at current focused tab.
+    if (this.state.key !== index || !remote.getCurrentWindow().isFocused()) {
+      unreadAtActive[index] = unreadAtActive[index] || isUnread;
+      mentionAtActive[index] = mentionAtActive[index] || isMentioned;
+    }
     this.setState({
       unreadCounts: unreadCounts,
-      mentionCounts: mentionCounts
+      mentionCounts: mentionCounts,
+      unreadAtActive: unreadAtActive,
+      mentionAtActive: mentionAtActive
     });
     this.handleUnreadCountTotalChange();
   },
-  handleUnreadAtActiveChange: function(index, isUnread, isMentioned) {
+  markReadAtActive: function(index) {
     var unreadAtActive = this.state.unreadAtActive;
     var mentionAtActive = this.state.mentionAtActive;
-    unreadAtActive[index] = isUnread;
-    mentionAtActive[index] = isMentioned;
+    unreadAtActive[index] = false;
+    mentionAtActive[index] = false;
     this.setState({
       unreadAtActive: unreadAtActive,
       mentionAtActive: mentionAtActive
@@ -93,16 +102,9 @@ var MainPage = React.createClass({
       this.props.onUnreadCountChange(allUnreadCount, allMentionCount);
     }
   },
-  handleNotify: function(index, isMentioned) {
-    // Never turn on the unreadAtActive flag at current focused tab.
-    if (this.state.key === index && remote.getCurrentWindow().isFocused()) {
-      return;
-    }
-    this.handleUnreadAtActiveChange(index, true, isMentioned);
-  },
   handleOnTeamFocused: function(index) {
     // Turn off the flag to indicate whether unread message of active channel contains at current tab.
-    this.handleUnreadAtActiveChange(index, false, false);
+    this.markReadAtActive(index);
   },
 
   visibleStyle: function(visible) {
@@ -123,24 +125,21 @@ var MainPage = React.createClass({
     if (this.props.teams.length > 1) {
       tabs_row = (
         <Row>
-          <TabBar id="tabBar" teams={ this.props.teams } unreadCounts={ this.state.unreadCounts } mentionCounts={ this.state.mentionCounts } unreadAtActive={ this.state.unreadAtActive } activeKey={ this.state.key }
-          onSelect={ this.handleSelect }></TabBar>
+          <TabBar id="tabBar" teams={ this.props.teams } unreadCounts={ this.state.unreadCounts } mentionCounts={ this.state.mentionCounts } unreadAtActive={ this.state.unreadAtActive } mentionAtActive={ this.state.mentionAtActive }
+          activeKey={ this.state.key } onSelect={ this.handleSelect }></TabBar>
         </Row>
       );
     }
 
     var views = this.props.teams.map(function(team, index) {
-      var handleUnreadCountChange = function(unreadCount, mentionCount) {
-        thisObj.handleUnreadCountChange(index, unreadCount, mentionCount);
-      };
-      var handleNotify = function(isMentioned) {
-        thisObj.handleNotify(index, isMentioned);
+      var handleUnreadCountChange = function(unreadCount, mentionCount, isUnread, isMentioned) {
+        thisObj.handleUnreadCountChange(index, unreadCount, mentionCount, isUnread, isMentioned);
       };
       var handleNotificationClick = function() {
         thisObj.handleSelect(index);
       }
-      return (<MattermostView id={ 'mattermostView' + index } style={ thisObj.visibleStyle(thisObj.state.key === index) } src={ team.url } onUnreadCountChange={ handleUnreadCountChange } onNotify={ handleNotify }
-              onNotificationClick={ handleNotificationClick } />)
+      return (<MattermostView id={ 'mattermostView' + index } style={ thisObj.visibleStyle(thisObj.state.key === index) } src={ team.url } onUnreadCountChange={ handleUnreadCountChange } onNotificationClick={ handleNotificationClick }
+              />)
     });
     var views_row = (<Row>
                        { views }
@@ -158,7 +157,6 @@ var TabBar = React.createClass({
   render: function() {
     var thisObj = this;
     var tabs = this.props.teams.map(function(team, index) {
-      var badge;
       var unreadCount = 0;
       if (thisObj.props.unreadCounts[index] > 0) {
         unreadCount = thisObj.props.unreadCounts[index];
@@ -166,9 +164,19 @@ var TabBar = React.createClass({
       if (thisObj.props.unreadAtActive[index]) {
         unreadCount += 1;
       }
-      if (thisObj.props.mentionCounts[index] != 0) {
+
+      var mentionCount = 0;
+      if (thisObj.props.mentionCounts[index] > 0) {
+        mentionCount = thisObj.props.mentionCounts[index];
+      }
+      if (thisObj.props.mentionAtActive[index] === true) {
+        mentionCount += 1;
+      }
+
+      var badge;
+      if (mentionCount != 0) {
         badge = (<Badge>
-                   { thisObj.props.mentionCounts[index] }
+                   { mentionCount }
                  </Badge>);
       } else if (unreadCount > 0) {
         badge = (<Badge>
@@ -192,23 +200,11 @@ var TabBar = React.createClass({
 var MattermostView = React.createClass({
   getInitialState: function() {
     return {
-      unreadCount: 0,
-      mentionCount: 0
     };
   },
-  handleUnreadCountChange: function(unreadCount, mentionCount) {
-    this.setState({
-      unreadCount: unreadCount,
-      mentionCount: mentionCount
-    });
+  handleUnreadCountChange: function(unreadCount, mentionCount, isUnread, isMentioned) {
     if (this.props.onUnreadCountChange) {
-      this.props.onUnreadCountChange(unreadCount, mentionCount);
-    }
-  },
-
-  handleNotify: function(isMentioned) {
-    if (this.props.onNotify) {
-      this.props.onNotify(isMentioned);
+      this.props.onUnreadCountChange(unreadCount, mentionCount, isUnread, isMentioned);
     }
   },
 
@@ -260,7 +256,10 @@ var MattermostView = React.createClass({
         case 'onUnreadCountChange':
           var unreadCount = event.args[0];
           var mentionCount = event.args[1];
-          thisObj.handleUnreadCountChange(unreadCount, mentionCount);
+          // isUnread and isMentioned is pulse flag.
+          var isUnread = event.args[2];
+          var isMentioned = event.args[3];
+          thisObj.handleUnreadCountChange(unreadCount, mentionCount, isUnread, isMentioned);
           break;
         case 'onNotificationClick':
           thisObj.props.onNotificationClick();
@@ -268,10 +267,6 @@ var MattermostView = React.createClass({
         case 'console':
           console.log(event.args[0]);
           break;
-        case 'onActiveChannelNotify':
-          var isMentioned = event.args[0];
-          thisObj.handleNotify(isMentioned);
-          break;
       }
     });
 
diff --git a/src/browser/webview/mattermost.js b/src/browser/webview/mattermost.js
index ade81305..d5a5a7d6 100644
--- a/src/browser/webview/mattermost.js
+++ b/src/browser/webview/mattermost.js
@@ -19,18 +19,71 @@ var unreadCountTimer = setInterval(function() {
   var elem = document.getElementsByClassName('badge')
   var mentionCount = 0;
   for (var i = 0; i < elem.length; i++) {
-    if (elem[i].offsetHeight != 0) {
+    if (isElementVisible(elem[i])) {
       mentionCount++;
     }
   }
 
-  if (this.unreadCount != unreadCount || this.mentionCount != mentionCount) {
-    ipc.sendToHost('onUnreadCountChange', unreadCount, mentionCount);
+  var postAttrName = 'data-reactid';
+  var lastPostElem = document.querySelector('div[' + postAttrName + '="' + lastCheckedPost.reactId + '"]');
+  var isUnread = false;
+  var isMentioned = false;
+  if (lastPostElem === null || !isElementVisible(lastPostElem)) {
+    // When load channel or change channel, lastCheckedPost.reactId is invalid.
+    // So we get latest post and save lastCheckedPost.
+
+    // find active post-list.
+    var postLists = document.querySelectorAll('div.post-list__content');
+    var post;
+    for (var i = 0; i < postLists.length; i++) {
+      if (isElementVisible(postLists[i])) {
+        post = postLists[i].children[0];
+      }
+    }
+
+    // find latest post and save.
+    while (post = post.nextSibling) {
+      if (post.nextSibling === null) {
+        if (post.getAttribute(postAttrName) !== null) {
+          lastCheckedPost.reactId = post.getAttribute(postAttrName);
+        }
+      }
+    }
+  }
+  else if (lastPostElem !== null) {
+    var newPostElem = lastPostElem;
+    while (newPostElem = newPostElem.nextSibling) {
+      lastCheckedPost.reactId = newPostElem.getAttribute(postAttrName);
+      isUnread = true;
+      var activeChannel = document.querySelector('.active .sidebar-channel');
+      var closeButton = activeChannel.getElementsByClassName('btn-close');
+      if (closeButton.length === 1 && closeButton[0].getAttribute('aria-describedby') === 'remove-dm-tooltip') {
+        // If active channel is DM, all posts is treated as menion.
+        isMentioned = true;
+        break;
+      }
+      else {
+        // If active channel is public/private channel, only mentioned post is treated as mention.
+        var highlight = newPostElem.getElementsByClassName('mention-highlight');
+        if (highlight.length != 0 && isElementVisible(highlight[0])) {
+          isMentioned = true;
+          break;
+        }
+      }
+    }
+  }
+
+  if (this.unreadCount != unreadCount || this.mentionCount != mentionCount || isUnread || isMentioned) {
+    ipc.sendToHost('onUnreadCountChange', unreadCount, mentionCount, isUnread, isMentioned);
   }
   this.unreadCount = unreadCount;
   this.mentionCount = mentionCount;
 }, 1000);
 
+function isElementVisible(elem) {
+  return elem.offsetHeight !== 0;
+}
+
 // On Windows 8.1 and Windows 8, a shortcut with a Application User Model ID must be installed to the Start screen.
 // In current version, use tray balloon for notification
 function isLowerThanOrEqualWindows8_1() {
@@ -48,12 +101,6 @@ function overrideNotificationWithBalloon() {
       title: title,
       options: options
     });
-
-    // Send notification event at active channel.
-    var activeChannel = document.querySelector('.active .sidebar-channel').text;
-    if (activeChannel === title) {
-      ipc.sendToHost('onActiveChannelNotify');
-    }
   };
   Notification.requestPermission = function(callback) {
     callback('granted');
@@ -61,69 +108,14 @@ function overrideNotificationWithBalloon() {
   Notification.prototype.close = function() {};
 };
 
-var lastUnread = {};
+var lastCheckedPost = {
+  reactId: null
+};
 
 // Show window even if it is hidden/minimized when notification is clicked.
 function overrideNotification() {
   Notification = function(title, options) {
     this.notification = new NativeNotification(title, options);
-
-    // Send notification event at active channel.
-    var activeChannel = document.querySelector('.active .sidebar-channel').text;
-    console.log(activeChannel);
-    console.log(title);
-
-    // mentionCount for active channel
-    var newSeparators = document.getElementsByClassName('new-separator');
-    var post;
-    var isMentioned = false;
-    // Skip until real new-separator appear.
-    for (var i = 0; i < newSeparators.length; i++) {
-      if (newSeparators[i].offsetParent !== null) {
-        post = newSeparators[i];
-      }
-    }
-
-    // If active channel is DM, all posts is treated as menion.
-    if (activeChannel === title + "×") {
-      isMentioned = true;
-    }
-    else {
-      // If active channel is CHANNEL, only .mention-highlight post is treated as mention.
-      if (post != null) {
-        // Skip posts until last unread.
-        if (activeChannel === title && lastUnread.channel === title && lastUnread.post !== null) {
-          var firstPost = post;
-          while (post = post.nextSibling) {
-            if (lastUnread.post === post.getAttribute('data-reactid')) {
-              break;
-            }
-          }
-          // Because last unread post not found, set first post.
-          if (post === null) {
-            post = firstPost;
-          }
-        }
-
-        while (post = post.nextSibling) {
-          var highlight = post.getElementsByClassName('mention-highlight');
-          if (highlight.length != 0 && highlight[0].offsetHeight != null) {
-            isMentioned = true;
-          }
-
-          // Remember last unread post.
-          if (post.nextSibling === null) {
-            lastUnread.post = post.getAttribute('data-reactid');
-            lastUnread.channel = title;
-          }
-        }
-      }
-    }
-
-    // Note: DM title is "{username}×". CHANNEL title is "{channel_title}".
-    if (activeChannel === title || activeChannel === title + "×") {
-      ipc.sendToHost('onActiveChannelNotify', isMentioned);
-    }
   };
   Notification.requestPermission = function(callback) {
     callback('granted');