diff --git a/src/main/resources/update/1_2.sql b/src/main/resources/update/1_2.sql
index 373596e..d2765bc 100644
--- a/src/main/resources/update/1_2.sql
+++ b/src/main/resources/update/1_2.sql
@@ -9,6 +9,16 @@
 		ACTIVITY_DATE TIMESTAMP NOT NULL
 );
 
+CREATE TABLE COMMIT_LOG (
+		USER_NAME VARCHAR(100) NOT NULL,
+		REPOSITORY_NAME VARCHAR(100) NOT NULL,
+		COMMIT_ID VARCHAR(40) NOT NULL
+);
+
 ALTER TABLE ACTIVITY ADD CONSTRAINT IDX_ACTIVITY_PK PRIMARY KEY (ACTIVITY_ID);
 ALTER TABLE ACTIVITY ADD CONSTRAINT IDX_ACTIVITY_FK0 FOREIGN KEY (USER_NAME, REPOSITORY_NAME) REFERENCES REPOSITORY (USER_NAME, REPOSITORY_NAME);
 ALTER TABLE ACTIVITY ADD CONSTRAINT IDX_ACTIVITY_FK1 FOREIGN KEY (ACTIVITY_USER_NAME) REFERENCES ACCOUNT (USER_NAME);
+
+ALTER TABLE COMMIT_LOG ADD CONSTRAINT IDX_COMMIT_LOG_PK PRIMARY KEY (USER_NAME, REPOSITORY_NAME, COMMIT_ID);
+ALTER TABLE COMMIT_LOG ADD CONSTRAINT IDX_COMMIT_LOG_FK0 FOREIGN KEY (USER_NAME, REPOSITORY_NAME) REFERENCES REPOSITORY (USER_NAME, REPOSITORY_NAME);
+
diff --git a/src/main/scala/model/Activity.scala b/src/main/scala/model/Activity.scala
index ba42bb6..ffba3d2 100644
--- a/src/main/scala/model/Activity.scala
+++ b/src/main/scala/model/Activity.scala
@@ -13,6 +13,12 @@
   def autoInc = userName ~ repositoryName ~ activityUserName ~ activityType ~ message ~ additionalInfo.? ~ activityDate returning activityId
 }
 
+object CommitLog extends Table[(String, String, String)]("COMMIT_LOG") with BasicTemplate {
+  def commitId = column[String]("COMMIT_ID")
+  def * = userName ~ repositoryName ~ commitId
+  def byPrimaryKey(userName: String, repositoryName: String, commitId: String) = byRepository(userName, repositoryName) && (this.commitId is commitId.bind)
+}
+
 case class Activity(
   activityId: Int,
   userName: String,
diff --git a/src/main/scala/service/ActivityService.scala b/src/main/scala/service/ActivityService.scala
index f225482..7fc64b5 100644
--- a/src/main/scala/service/ActivityService.scala
+++ b/src/main/scala/service/ActivityService.scala
@@ -87,14 +87,20 @@
       None,
       currentDate)
   
-  def recordCreateBranchActivity(userName: String, repositoryName: String, activityUserName: String, 
-      branchName: String, commits: List[util.JGitUtil.CommitInfo]) =
+  def recordCreateBranchActivity(userName: String, repositoryName: String, activityUserName: String, branchName: String) =
     Activities.autoInc insert(userName, repositoryName, activityUserName,
       "create_tag",
       s"[user:${activityUserName}] created branch [tag:${userName}/${repositoryName}#${branchName}] at [repo:${userName}/${repositoryName}]",
       None,
       currentDate)
   
+  def insertCommitId(userName: String, repositoryName: String, commitId: String) = {
+    CommitLog insert (userName, repositoryName, commitId)
+  }
+  
+  def existsCommitId(userName: String, repositoryName: String, commitId: String): Boolean =
+    Query(CommitLog).filter(_.byPrimaryKey(userName, repositoryName, commitId)).firstOption.isDefined
+  
   private def cut(value: String, length: Int): String = 
     if(value.length > length) value.substring(0, length) + "..." else value
 }
diff --git a/src/main/scala/servlet/GitRepositoryServlet.scala b/src/main/scala/servlet/GitRepositoryServlet.scala
index 61e6106..811c27b 100644
--- a/src/main/scala/servlet/GitRepositoryServlet.scala
+++ b/src/main/scala/servlet/GitRepositoryServlet.scala
@@ -76,37 +76,37 @@
     JGitUtil.withGit(Directory.getRepositoryDir(owner, repository)) { git =>
       commands.asScala.foreach { command =>
         val commits = JGitUtil.getCommitLog(git, command.getOldId.name, command.getNewId.name)
-          .filter(commit => JGitUtil.getBranchesOfCommit(git, commit.id).length == 1)
         val refName = command.getRefName.split("/")
         
-        println("****************************")
-        println(command.getRefName)
-        println(command.getMessage)
-        println(command.getResult)
-        println(command.getType)
-        println("****************************")
-        
         // apply issue comment
-        if(refName(1) == "heads"){
-          commits.foreach { commit =>
+        val newCommits = commits.flatMap { commit =>
+          if(!existsCommitId(owner, repository, commit.id)){
+            insertCommitId(owner, repository, commit.id)
             "(^|\\W)#(\\d+)(\\W|$)".r.findAllIn(commit.fullMessage).matchData.foreach { matchData =>
               val issueId = matchData.group(2)
               if(getAccountByUserName(commit.committer).isDefined && getIssue(owner, repository, issueId).isDefined){
                 createComment(owner, repository, commit.committer, issueId.toInt, commit.fullMessage, None)
               }
             }
-          }
-        }
-        
-        git.getRepository.getAllRefs.asScala.map { e =>
-          println(e._1)
-        }
+            Some(commit)
+          } else None
+        }.toList
         
         // record activity
         if(refName(1) == "heads"){
-          recordPushActivity(owner, repository, userName, refName(2), commits)
+          command.getType match {
+            case ReceiveCommand.Type.CREATE => {
+              recordCreateBranchActivity(owner, repository, userName, refName(2))
+              recordPushActivity(owner, repository, userName, refName(2), newCommits)
+            }
+            case ReceiveCommand.Type.UPDATE => recordPushActivity(owner, repository, userName, refName(2), newCommits)
+            case _ =>
+          }
         } else if(refName(1) == "tags"){
-          recordCreateTagActivity(owner, repository, userName, refName(2), commits)
+          command.getType match {
+            case ReceiveCommand.Type.CREATE => recordCreateTagActivity(owner, repository, userName, refName(2), newCommits)
+            case _ =>
+          }
         }
       }
     }
diff --git a/src/main/twirl/account/activity.scala.html b/src/main/twirl/account/activity.scala.html
index e5008c8..4c41c2e 100644
--- a/src/main/twirl/account/activity.scala.html
+++ b/src/main/twirl/account/activity.scala.html
@@ -20,18 +20,18 @@
         } else {
           @activities.map { activity =>
             <div class="block">
-              <div class="muted smal">@datetime(activity.activityDate)</div>
+              <div class="muted small">@datetime(activity.activityDate)</div>
               <div class="strong">@activityMessage(activity.message)</div>
               @activity.additionalInfo.map { additionalInfo =>
                 @(activity.activityType match {
                   case "create_wiki" => {
-                    <div>Created <a href={"%s/%s/%s/wiki/%s".format(path, activity.userName, activity.repositoryName, additionalInfo)}>{additionalInfo}</a>.</div>
+                    <div class="small">Created <a href={"%s/%s/%s/wiki/%s".format(path, activity.userName, activity.repositoryName, additionalInfo)}>{additionalInfo}</a>.</div>
                   }
                   case "edit_wiki" => {
-                    <div>Edited <a href={"%s/%s/%s/wiki/%s".format(path, activity.userName, activity.repositoryName, additionalInfo)}>{additionalInfo}</a>.</div>
+                    <div class="small">Edited <a href={"%s/%s/%s/wiki/%s".format(path, activity.userName, activity.repositoryName, additionalInfo)}>{additionalInfo}</a>.</div>
                   }
                   case "push" => {
-                    <div>
+                    <div class="small">
                       {additionalInfo.split("\n").map{ commit => 
                         <div>
                           <a href={"%s/%s/%s/commit/%s".format(path, activity.userName, activity.repositoryName, commit.substring(0, 40))} class="monospace">{commit.substring(0, 7)}</a>