diff --git a/src/main/scala/app/PullRequestsController.scala b/src/main/scala/app/PullRequestsController.scala
index 1f8453c..bf3bea2 100644
--- a/src/main/scala/app/PullRequestsController.scala
+++ b/src/main/scala/app/PullRequestsController.scala
@@ -79,7 +79,7 @@
           pulls.html.pullreq(
             issue, pullreq,
             getComments(owner, name, issueId),
-            getIssueLabels(owner, name, issueId.toInt),
+            getIssueLabels(owner, name, issueId),
             (getCollaborators(owner, name) ::: (if(getAccountByUserName(owner).get.isGroupAccount) Nil else List(owner))).sorted,
             getMilestonesWithIssueCount(owner, name),
             getLabels(owner, name),
@@ -183,6 +183,18 @@
               }
             }
 
+            // close issue by content of pull request
+            val defaultBranch = getRepository(owner, name, baseUrl).get.repository.defaultBranch
+            if(pullreq.branch == defaultBranch){
+              commits.flatten.foreach { commit =>
+                closeIssuesFromMessage(commit.fullMessage, loginAccount.userName, owner, name)
+              }
+              issue.content match {
+                case Some(content) => closeIssuesFromMessage(content, loginAccount.userName, owner, name)
+                case _ =>
+              }
+              closeIssuesFromMessage(form.message, loginAccount.userName, owner, name)
+            }
             // call web hook
             getWebHookURLs(owner, name) match {
               case webHookURLs if(webHookURLs.nonEmpty) =>
diff --git a/src/main/scala/service/IssuesService.scala b/src/main/scala/service/IssuesService.scala
index 54edaf3..b121599 100644
--- a/src/main/scala/service/IssuesService.scala
+++ b/src/main/scala/service/IssuesService.scala
@@ -8,6 +8,7 @@
 import model._
 import util.Implicits._
 import util.StringUtil._
+import util.StringUtil
 
 trait IssuesService {
   import IssuesService._
@@ -314,6 +315,14 @@
     }.toList
   }
 
+  def closeIssuesFromMessage(message: String, userName: String, owner: String, repository: String) = {
+    StringUtil.extractCloseId(message).foreach { issueId =>
+      for(issue <- getIssue(owner, repository, issueId) if !issue.closed){
+        createComment(owner, repository, userName, issue.issueId, "Close", "close")
+        updateClosed(owner, repository, issue.issueId, true)
+      }
+    }
+  }
 }
 
 object IssuesService {
diff --git a/src/main/scala/servlet/GitRepositoryServlet.scala b/src/main/scala/servlet/GitRepositoryServlet.scala
index 2c521c8..9efefd3 100644
--- a/src/main/scala/servlet/GitRepositoryServlet.scala
+++ b/src/main/scala/servlet/GitRepositoryServlet.scala
@@ -141,6 +141,14 @@
             }
           }
 
+          // close issues
+          val defaultBranch = getRepository(owner, repository, baseUrl).get.repository.defaultBranch
+          if(refName(1) == "heads" && branchName == defaultBranch && command.getType == ReceiveCommand.Type.UPDATE){
+            git.log.addRange(command.getOldId, command.getNewId).call.asScala.foreach { commit =>
+              closeIssuesFromMessage(commit.getFullMessage, pusher, owner, repository)
+            }
+          }
+
           // call web hook
           getWebHookURLs(owner, repository) match {
             case webHookURLs if(webHookURLs.nonEmpty) =>
diff --git a/src/main/scala/util/StringUtil.scala b/src/main/scala/util/StringUtil.scala
index 7de2a62..54da029 100644
--- a/src/main/scala/util/StringUtil.scala
+++ b/src/main/scala/util/StringUtil.scala
@@ -31,7 +31,7 @@
 
   /**
    * Make string from byte array. Character encoding is detected automatically by [[util.StringUtil.detectEncoding]].
-   * And if given bytes contains UTF-8 BOM, it's removed from returned string..
+   * And if given bytes contains UTF-8 BOM, it's removed from returned string.
    */
   def convertFromByteArray(content: Array[Byte]): String =
     IOUtils.toString(new BOMInputStream(new java.io.ByteArrayInputStream(content)), detectEncoding(content))
@@ -47,12 +47,21 @@
     }
 
   /**
-   * Extract issue id like ````#issueId``` from the given message.
+   * Extract issue id like ```#issueId``` from the given message.
    *
    *@param message the message which may contains issue id
    * @return the iterator of issue id
    */
   def extractIssueId(message: String): Iterator[String] =
-    "(^|\\W)#(\\d+)(\\W|$)".r.findAllIn(message).matchData.map { matchData =>  matchData.group(2) }
+    "(^|\\W)#(\\d+)(\\W|$)".r.findAllIn(message).matchData.map(_.group(2))
+
+  /**
+   * Extract close issue id like ```close #issueId ``` from the given message.
+   *
+   * @param message the message which may contains close command
+   * @return the iterator of issue id
+   */
+  def extractCloseId(message: String): Iterator[String] =
+    "(?i)(?<!\\w)(?:fix(?:e[sd])?|resolve[sd]?|close[sd]?)\\s+#(\\d+)(?!\\w)".r.findAllIn(message).matchData.map(_.group(1))
 
 }
diff --git a/src/test/scala/util/StringUtilSpec.scala b/src/test/scala/util/StringUtilSpec.scala
index 26056a5..caaa2dc 100644
--- a/src/test/scala/util/StringUtilSpec.scala
+++ b/src/test/scala/util/StringUtilSpec.scala
@@ -35,4 +35,22 @@
       StringUtil.sha1("abc") mustEqual "a9993e364706816aba3e25717850c26c9cd0d89d"
     }
   }
+
+  "extractIssueId" should {
+    "extract '#xxx' and return extracted id" in {
+      StringUtil.extractIssueId("(refs #123)").toSeq mustEqual Seq("123")
+    }
+    "returns Nil from message which does not contain #xxx" in {
+      StringUtil.extractIssueId("this is test!").toSeq mustEqual Nil
+    }
+  }
+
+  "extractCloseId" should {
+    "extract 'close #xxx' and return extracted id" in {
+      StringUtil.extractCloseId("(close #123)").toSeq mustEqual Seq("123")
+    }
+    "returns Nil from message which does not contain close command" in {
+      StringUtil.extractCloseId("(refs #123)").toSeq mustEqual Nil
+    }
+  }
 }