diff --git a/src/main/scala/app/IssuesController.scala b/src/main/scala/app/IssuesController.scala
index 3fb59ae..4fe478e 100644
--- a/src/main/scala/app/IssuesController.scala
+++ b/src/main/scala/app/IssuesController.scala
@@ -187,7 +187,7 @@
           org.json4s.jackson.Serialization.write(
               Map("title"   -> x.title,
                   "content" -> view.Markdown.toHtml(x.content getOrElse "No description given.",
-                      repository, false, true, true)
+                      repository, false, true, true, isEditable(x.userName, x.repositoryName, x.openedUserName))
               ))
         }
       } else Unauthorized
@@ -204,7 +204,7 @@
           contentType = formats("json")
           org.json4s.jackson.Serialization.write(
               Map("content" -> view.Markdown.toHtml(x.content,
-                  repository, false, true, true)
+                  repository, false, true, true, isEditable(x.userName, x.repositoryName, x.commentedUserName))
               ))
         }
       } else Unauthorized
diff --git a/src/main/scala/app/RepositoryViewerController.scala b/src/main/scala/app/RepositoryViewerController.scala
index 18cff36..18a9f3f 100644
--- a/src/main/scala/app/RepositoryViewerController.scala
+++ b/src/main/scala/app/RepositoryViewerController.scala
@@ -78,7 +78,8 @@
     view.helpers.markdown(params("content"), repository,
       params("enableWikiLink").toBoolean,
       params("enableRefsLink").toBoolean,
-      params("enableTaskList").toBoolean)
+      params("enableTaskList").toBoolean,
+      hasWritePermission(repository.owner, repository.name, context.loginAccount))
   })
 
   /**
diff --git a/src/main/scala/view/Markdown.scala b/src/main/scala/view/Markdown.scala
index 90a00ff..e7c9cd6 100644
--- a/src/main/scala/view/Markdown.scala
+++ b/src/main/scala/view/Markdown.scala
@@ -11,7 +11,7 @@
 import java.util.Locale
 import java.util.regex.Pattern
 import scala.collection.JavaConverters._
-import service.{RepositoryService, RequestCache, WikiService}
+import service.{RequestCache, WikiService}
 
 object Markdown {
 
@@ -19,7 +19,8 @@
    * Converts Markdown of Wiki pages to HTML.
    */
   def toHtml(markdown: String, repository: service.RepositoryService.RepositoryInfo,
-             enableWikiLink: Boolean, enableRefsLink: Boolean, enableTaskList: Boolean = false)(implicit context: app.Context): String = {
+             enableWikiLink: Boolean, enableRefsLink: Boolean,
+             enableTaskList: Boolean = false, hasWritePermission: Boolean = false)(implicit context: app.Context): String = {
     // escape issue id
     val s = if(enableRefsLink){
       markdown.replaceAll("(?<=(\\W|^))#(\\d+)(?=(\\W|$))", "issue:$2")
@@ -34,7 +35,7 @@
       Extensions.AUTOLINKS | Extensions.WIKILINKS | Extensions.FENCED_CODE_BLOCKS | Extensions.TABLES | Extensions.HARDWRAPS
     ).parseMarkdown(source.toCharArray)
 
-    new GitBucketHtmlSerializer(markdown, repository, enableWikiLink, enableRefsLink, enableTaskList).toHtml(rootNode)
+    new GitBucketHtmlSerializer(markdown, repository, enableWikiLink, enableRefsLink, enableTaskList, hasWritePermission).toHtml(rootNode)
   }
 }
 
@@ -89,11 +90,12 @@
     repository: service.RepositoryService.RepositoryInfo,
     enableWikiLink: Boolean,
     enableRefsLink: Boolean,
-    enableTaskList: Boolean
+    enableTaskList: Boolean,
+    hasWritePermission: Boolean
   )(implicit val context: app.Context) extends ToHtmlSerializer(
     new GitBucketLinkRender(context, repository, enableWikiLink),
     Map[String, VerbatimSerializer](VerbatimSerializer.DEFAULT -> new GitBucketVerbatimSerializer).asJava
-  ) with RepositoryService with LinkConverter with RequestCache {
+  ) with LinkConverter with RequestCache {
 
   override protected def printImageTag(imageNode: SuperNode, url: String): Unit =
     printer.print("<a target=\"_blank\" href=\"").print(fixUrl(url)).print("\">")
@@ -147,7 +149,7 @@
     val t = if(enableRefsLink) convertRefsLinks(node.getText, repository, "issue:") else node.getText
 
     // convert task list to checkbox.
-    val text = if(enableTaskList) GitBucketHtmlSerializer.convertCheckBox(t, hasWritePermission(repository.owner, repository.name, context.loginAccount)) else t
+    val text = if(enableTaskList) GitBucketHtmlSerializer.convertCheckBox(t, hasWritePermission) else t
 
     if (abbreviations.isEmpty) {
       printer.print(text)
diff --git a/src/main/scala/view/helpers.scala b/src/main/scala/view/helpers.scala
index 73433bb..7c11f1b 100644
--- a/src/main/scala/view/helpers.scala
+++ b/src/main/scala/view/helpers.scala
@@ -48,8 +48,8 @@
    * Converts Markdown of Wiki pages to HTML.
    */
   def markdown(value: String, repository: service.RepositoryService.RepositoryInfo,
-               enableWikiLink: Boolean, enableRefsLink: Boolean, enableTaskList: Boolean = false)(implicit context: app.Context): Html =
-    Html(Markdown.toHtml(value, repository, enableWikiLink, enableRefsLink, enableTaskList))
+               enableWikiLink: Boolean, enableRefsLink: Boolean, enableTaskList: Boolean = false, hasWritePermission: Boolean = false)(implicit context: app.Context): Html =
+    Html(Markdown.toHtml(value, repository, enableWikiLink, enableRefsLink, enableTaskList, hasWritePermission))
 
   def renderMarkup(filePath: List[String], fileContent: String, branch: String,
                    repository: service.RepositoryService.RepositoryInfo,
diff --git a/src/main/twirl/helper/preview.scala.html b/src/main/twirl/helper/preview.scala.html
index 2b04c89..3c0e13e 100644
--- a/src/main/twirl/helper/preview.scala.html
+++ b/src/main/twirl/helper/preview.scala.html
@@ -1,4 +1,4 @@
-@(repository: service.RepositoryService.RepositoryInfo, content: String, enableWikiLink: Boolean, enableRefsLink: Boolean, enableTaskList: Boolean,
+@(repository: service.RepositoryService.RepositoryInfo, content: String, enableWikiLink: Boolean, enableRefsLink: Boolean, enableTaskList: Boolean, hasWritePermission: Boolean,
   style: String = "", placeholder: String = "Leave a comment", elastic: Boolean = false)(implicit context: app.Context)
 @import context._
 @import view.helpers._
diff --git a/src/main/twirl/issues/commentform.scala.html b/src/main/twirl/issues/commentform.scala.html
index 67a532c..edabb5d 100644
--- a/src/main/twirl/issues/commentform.scala.html
+++ b/src/main/twirl/issues/commentform.scala.html
@@ -9,7 +9,7 @@
     <div class="issue-avatar-image">@avatar(loginAccount.get.userName, 48)</div>
       <div class="box issue-comment-box">
       <div class="box-content">
-        @helper.html.preview(repository, "", false, true, true, "width: 635px; height: 100px; max-height: 150px;", elastic = true)
+        @helper.html.preview(repository, "", false, true, true, hasWritePermission, "width: 635px; height: 100px; max-height: 150px;", elastic = true)
       </div>
     </div>
     <div class="pull-right">
diff --git a/src/main/twirl/issues/commentlist.scala.html b/src/main/twirl/issues/commentlist.scala.html
index 1605c23..171e712 100644
--- a/src/main/twirl/issues/commentlist.scala.html
+++ b/src/main/twirl/issues/commentlist.scala.html
@@ -30,7 +30,7 @@
         @if(comment.action == "commit" && comment.content.split(" ").last.matches("[a-f0-9]{40}")){
           @defining(comment.content.substring(comment.content.length - 40)){ id =>
             <div class="pull-right"><a href="@path/@repository.owner/@repository.name/commit/@id" class="monospace">@id.substring(0, 7)</a></div>
-            @markdown(comment.content.substring(0, comment.content.length - 41), repository, false, true, true)
+            @markdown(comment.content.substring(0, comment.content.length - 41), repository, false, true, true, hasWritePermission)
           }
         } else {
           @if(comment.action == "refer"){
@@ -38,7 +38,7 @@
               <strong><a href="@path/@repository.owner/@repository.name/issues/@issueId">Issue #@issueId</a>: @rest.mkString(":")</strong>
             }
           } else {
-            @markdown(comment.content, repository, false, true, true)
+            @markdown(comment.content, repository, false, true, true, hasWritePermission)
           }
         }
       </div>
diff --git a/src/main/twirl/issues/create.scala.html b/src/main/twirl/issues/create.scala.html
index 3d8faad..bcb234c 100644
--- a/src/main/twirl/issues/create.scala.html
+++ b/src/main/twirl/issues/create.scala.html
@@ -56,7 +56,7 @@
               </div>
             </div>
             <hr>
-            @helper.html.preview(repository, "", false, true, true, "width: 565px; height: 200px; max-height: 250px;", elastic = true)
+            @helper.html.preview(repository, "", false, true, true, hasWritePermission, "width: 565px; height: 200px; max-height: 250px;", elastic = true)
           </div>
         </div>
         <div class="pull-right">
diff --git a/src/main/twirl/issues/issuedetail.scala.html b/src/main/twirl/issues/issuedetail.scala.html
index 2bab957..e8c4e27 100644
--- a/src/main/twirl/issues/issuedetail.scala.html
+++ b/src/main/twirl/issues/issuedetail.scala.html
@@ -77,7 +77,7 @@
       </div>
     </div>
     <div class="issue-content" id="issueContent">
-      @markdown(issue.content getOrElse "No description given.", repository, false, true, true)
+      @markdown(issue.content getOrElse "No description given.", repository, false, true, true, hasWritePermission)
     </div>
   </div>
 </div>
diff --git a/src/main/twirl/pulls/compare.scala.html b/src/main/twirl/pulls/compare.scala.html
index 0ffaab7..7d900ab 100644
--- a/src/main/twirl/pulls/compare.scala.html
+++ b/src/main/twirl/pulls/compare.scala.html
@@ -58,7 +58,7 @@
               <div style="width: 600px; border-right: 1px solid #d4d4d4;">
                 <span class="error" id="error-title"></span>
                 <input type="text" name="title" style="width: 580px" placeholder="Title"/>
-                @helper.html.preview(repository, "", false, true, true, "width: 580px; height: 200px;")
+                @helper.html.preview(repository, "", false, true, true, hasWritePermission, "width: 580px; height: 200px;")
                 <input type="hidden" name="targetUserName" value="@originRepository.owner"/>
                 <input type="hidden" name="targetBranch" value="@originId"/>
                 <input type="hidden" name="requestUserName" value="@forkedRepository.owner"/>
diff --git a/src/main/twirl/wiki/edit.scala.html b/src/main/twirl/wiki/edit.scala.html
index f3fbdaf..36a61dc 100644
--- a/src/main/twirl/wiki/edit.scala.html
+++ b/src/main/twirl/wiki/edit.scala.html
@@ -22,7 +22,7 @@
     <form action="@url(repository)/wiki/@if(page.isEmpty){_new} else {_edit}" method="POST" validate="true">
       <span id="error-pageName" class="error"></span>
       <input type="text" name="pageName" value="@pageName" style="width: 850px; font-weight: bold;" placeholder="Input a page name."/>
-      @helper.html.preview(repository, page.map(_.content).getOrElse(""), true, false, false, "width: 850px; height: 400px;", "")
+      @helper.html.preview(repository, page.map(_.content).getOrElse(""), true, false, false, false, "width: 850px; height: 400px;", "")
       <input type="text" name="message" value="" style="width: 850px;" placeholder="Write a small message here explaining this change. (Optional)"/>
       <input type="hidden" name="currentPageName" value="@pageName"/>
       <input type="hidden" name="id" value="@page.map(_.id)"/>