diff --git a/src/main/resources/update/1_5.sql b/src/main/resources/update/1_5.sql
index 3f85dc0..21a8337 100644
--- a/src/main/resources/update/1_5.sql
+++ b/src/main/resources/update/1_5.sql
@@ -1,6 +1,7 @@
 ALTER TABLE REPOSITORY ADD COLUMN ORIGIN_USER_NAME VARCHAR(100);
 ALTER TABLE REPOSITORY ADD COLUMN ORIGIN_REPOSITORY_NAME VARCHAR(100);
-
+ALTER TABLE REPOSITORY ADD COLUMN PARENT_USER_NAME VARCHAR(100);
+ALTER TABLE REPOSITORY ADD COLUMN PARENT_REPOSITORY_NAME VARCHAR(100);
 
 CREATE TABLE PULL_REQUEST(
 		USER_NAME VARCHAR(100) NOT NULL,
diff --git a/src/main/scala/app/CreateRepositoryController.scala b/src/main/scala/app/CreateRepositoryController.scala
index 0aa12e9..403fbed 100644
--- a/src/main/scala/app/CreateRepositoryController.scala
+++ b/src/main/scala/app/CreateRepositoryController.scala
@@ -116,8 +116,20 @@
     if(getRepository(loginUserName, repository.name, baseUrl).isEmpty){
       // Insert to the database at first
       // TODO Is private repository cloneable?
-      createRepository(repository.name, loginUserName, repository.repository.description,
-        repository.repository.isPrivate, Some(repository.name), Some(repository.owner))
+
+      val originUserName = repository.repository.originUserName.getOrElse(repository.owner)
+      val originRepositoryName = repository.repository.originRepositoryName.getOrElse(repository.name)
+
+      createRepository(
+        repositoryName       = repository.name,
+        userName             = loginUserName,
+        description          = repository.repository.description,
+        isPrivate            = repository.repository.isPrivate,
+        originRepositoryName = Some(originRepositoryName),
+        originUserName       = Some(originUserName),
+        parentRepositoryName = Some(repository.name),
+        parentUserName       = Some(repository.owner)
+      )
 
       // Insert default labels
       insertDefaultLabels(loginUserName, repository.name)
diff --git a/src/main/scala/app/RepositoryViewerController.scala b/src/main/scala/app/RepositoryViewerController.scala
index e4dc1ed..6c3b1d7 100644
--- a/src/main/scala/app/RepositoryViewerController.scala
+++ b/src/main/scala/app/RepositoryViewerController.scala
@@ -202,6 +202,14 @@
       BadRequest
     }
   })
+
+  get("/:owner/:repository/network/members")(referrersOnly { repository =>
+    repo.html.forked(
+      getForkedRepositoryTree(
+        repository.repository.originUserName.getOrElse(repository.owner),
+        repository.repository.originRepositoryName.getOrElse(repository.name)),
+      repository)
+  })
   
   /**
    * Provides HTML of the file list.
diff --git a/src/main/scala/model/Repository.scala b/src/main/scala/model/Repository.scala
index 1c1f2e9..215b670 100644
--- a/src/main/scala/model/Repository.scala
+++ b/src/main/scala/model/Repository.scala
@@ -11,7 +11,9 @@
   def lastActivityDate = column[java.util.Date]("LAST_ACTIVITY_DATE")
   def originUserName = column[String]("ORIGIN_USER_NAME")
   def originRepositoryName = column[String]("ORIGIN_REPOSITORY_NAME")
-  def * = userName ~ repositoryName ~ isPrivate ~ description.? ~ defaultBranch ~ registeredDate ~ updatedDate ~ lastActivityDate ~ originUserName.? ~ originRepositoryName.? <> (Repository, Repository.unapply _)
+  def parentUserName = column[String]("PARENT_USER_NAME")
+  def parentRepositoryName = column[String]("PARENT_REPOSITORY_NAME")
+  def * = userName ~ repositoryName ~ isPrivate ~ description.? ~ defaultBranch ~ registeredDate ~ updatedDate ~ lastActivityDate ~ originUserName.? ~ originRepositoryName.? ~ parentUserName.? ~ parentRepositoryName.? <> (Repository, Repository.unapply _)
 
   def byPrimaryKey(owner: String, repository: String) = byRepository(owner, repository)
 }
@@ -26,5 +28,7 @@
   updatedDate: java.util.Date,
   lastActivityDate: java.util.Date,
   originUserName: Option[String],
-  originRepositoryName: Option[String]
+  originRepositoryName: Option[String],
+  parentUserName: Option[String],
+  parentRepositoryName: Option[String]
 )
diff --git a/src/main/scala/service/RepositoryService.scala b/src/main/scala/service/RepositoryService.scala
index b9ce2e2..ff9d66b 100644
--- a/src/main/scala/service/RepositoryService.scala
+++ b/src/main/scala/service/RepositoryService.scala
@@ -19,7 +19,8 @@
    * @param originUserName specify for the forked repository. (default is None)
    */
   def createRepository(repositoryName: String, userName: String, description: Option[String], isPrivate: Boolean,
-                       originRepositoryName: Option[String] = None, originUserName: Option[String] = None): Unit = {
+                       originRepositoryName: Option[String] = None, originUserName: Option[String] = None,
+                       parentRepositoryName: Option[String] = None, parentUserName: Option[String] = None): Unit = {
     Repositories insert
       Repository(
         userName             = userName,
@@ -31,8 +32,10 @@
         updatedDate          = currentDate,
         lastActivityDate     = currentDate,
         originUserName       = originUserName,
-        originRepositoryName = originRepositoryName)
-    
+        originRepositoryName = originRepositoryName,
+        parentUserName       = parentUserName,
+        parentRepositoryName = parentRepositoryName)
+
     IssueId insert (userName, repositoryName, 0)
   }
 
@@ -87,7 +90,13 @@
     }
 
     q1.union(q2).filter(visibleFor(_, loginUserName)).sortBy(_.lastActivityDate desc).list map { repository =>
-      new RepositoryInfo(JGitUtil.getRepositoryInfo(repository.userName, repository.repositoryName, baseUrl), repository)
+      new RepositoryInfo(
+        JGitUtil.getRepositoryInfo(repository.userName, repository.repositoryName, baseUrl),
+        repository,
+        getForkedCount(
+          repository.originUserName.getOrElse(repository.userName),
+          repository.originRepositoryName.getOrElse(repository.repositoryName)
+        ))
     }
   }
 
@@ -101,7 +110,13 @@
    */
   def getRepository(userName: String, repositoryName: String, baseUrl: String): Option[RepositoryInfo] = {
     (Query(Repositories) filter { t => t.byRepository(userName, repositoryName) } firstOption) map { repository =>
-      new RepositoryInfo(JGitUtil.getRepositoryInfo(repository.userName, repository.repositoryName, baseUrl), repository)
+      new RepositoryInfo(
+        JGitUtil.getRepositoryInfo(repository.userName, repository.repositoryName, baseUrl),
+        repository,
+        getForkedCount(
+          repository.originUserName.getOrElse(repository.userName),
+          repository.originRepositoryName.getOrElse(repository.repositoryName)
+        ))
     }
   }
 
@@ -115,7 +130,13 @@
   def getAccessibleRepositories(account: Option[Account], baseUrl: String): List[RepositoryInfo] = {
 
     def newRepositoryInfo(repository: Repository): RepositoryInfo = {
-      new RepositoryInfo(JGitUtil.getRepositoryInfo(repository.userName, repository.repositoryName, baseUrl), repository)
+      new RepositoryInfo(
+        JGitUtil.getRepositoryInfo(repository.userName, repository.repositoryName, baseUrl),
+        repository,
+        getForkedCount(
+          repository.originUserName.getOrElse(repository.userName),
+          repository.originRepositoryName.getOrElse(repository.repositoryName)
+        ))
     }
 
     (account match {
@@ -194,28 +215,39 @@
     }
   }
 
-//  def getBaseRepositories(userName: String, repositoryName: String, repositories: List[String] = Nil): List[String] = {
-//    Query(Repositories).filter { t =>
-//      (t.originUserName is userName.bind) && (t.originRepositoryName is repositoryName.bind)
-//    }.map(_.userName).list match {
-//      case Nil  => repositories.sorted
-//      case list => list.map { x =>
-//        getBaseRepositories(x, repositoryName, x :: repositories)
-//      }.flatten
-//    }
-//  }
+  // TODO It must be _.length instead of map (_.issueId) list).length.
+  //       But it does not work on Slick 1.0.1 (worked on Slick 1.0.0).
+  //       https://github.com/slick/slick/issues/170
+  private def getForkedCount(userName: String, repositoryName: String): Int =
+    Query(Repositories).filter { t =>
+      (t.originUserName is userName.bind) && (t.originRepositoryName is repositoryName.bind)
+    }.list.length
+
+
+  def getForkedRepositoryTree(userName: String, repositoryName: String): RepositoryTreeNode = {
+    RepositoryTreeNode(userName, repositoryName,
+      Query(Repositories).filter { t =>
+        (t.parentUserName is userName.bind) && (t.parentRepositoryName is repositoryName.bind)
+      }.map { t =>
+        t.userName ~ t.repositoryName
+      }.list.map { case (userName, repositoryName) =>
+        getForkedRepositoryTree(userName, repositoryName)
+      }
+    )
+  }
 
 }
 
 object RepositoryService {
 
   case class RepositoryInfo(owner: String, name: String, url: String, repository: Repository,
-    commitCount: Int, branchList: List[String], tags: List[util.JGitUtil.TagInfo]){
+    commitCount: Int, forkedCount: Int, branchList: List[String], tags: List[util.JGitUtil.TagInfo]){
 
-    def this(repo: JGitUtil.RepositoryInfo, model: Repository) = {
-      this(repo.owner, repo.name, repo.url, model, repo.commitCount, repo.branchList, repo.tags)
+    def this(repo: JGitUtil.RepositoryInfo, model: Repository, forkedCount: Int) = {
+      this(repo.owner, repo.name, repo.url, model, repo.commitCount, forkedCount, repo.branchList, repo.tags)
     }
-
   }
 
+  case class RepositoryTreeNode(owner: String, name: String, children: List[RepositoryTreeNode])
+
 }
\ No newline at end of file
diff --git a/src/main/twirl/account/repositories.scala.html b/src/main/twirl/account/repositories.scala.html
index 03f2c6e..97045d9 100644
--- a/src/main/twirl/account/repositories.scala.html
+++ b/src/main/twirl/account/repositories.scala.html
@@ -16,7 +16,7 @@
           }
         </div>
         @if(repository.repository.originUserName.isDefined){
-          <div class="small muted">forked from <a href="@path/@repository.repository.originUserName/@repository.repository.originRepositoryName">@repository.repository.originUserName/@repository.repository.originRepositoryName</a></div>
+          <div class="small muted">forked from <a href="@path/@repository.repository.parentUserName/@repository.repository.parentRepositoryName">@repository.repository.parentUserName/@repository.repository.parentRepositoryName</a></div>
         }
         @if(repository.repository.description.isDefined){
           <div>@repository.repository.description</div>
diff --git a/src/main/twirl/header.scala.html b/src/main/twirl/header.scala.html
index 191374c..c29a1f5 100644
--- a/src/main/twirl/header.scala.html
+++ b/src/main/twirl/header.scala.html
@@ -2,7 +2,10 @@
 @import context._
 @import view.helpers._
 <div class="pull-right">
-  <input type="button" id="fork" class="btn" value="Fork" style="margin-bottom: 10px;"/>
+  <div class="input-prepend">
+    <input type="button" id="fork" class="btn" value="Fork" style="margin-bottom: 10px;"/>
+    <span class="add-on"><a href="@url(repository)/network/members">@repository.forkedCount</a></span>
+  </div>
 </div>
 <div class="head">
   <a href="@url(repository.owner)">@repository.owner</a> / <a href="@url(repository)">@repository.name</a>
@@ -12,7 +15,7 @@
   @defining(repository.repository){ x =>
     @if(repository.repository.originRepositoryName.isDefined){
       <div class="forked">
-        forked from <a href="@path/@x.originUserName/@x.originRepositoryName">@x.originUserName/@x.originRepositoryName</a>
+        forked from <a href="@path/@x.parentUserName/@x.parentRepositoryName">@x.parentUserName/@x.parentRepositoryName</a>
       </div>
     }
   }
diff --git a/src/main/twirl/repo/forked.scala.html b/src/main/twirl/repo/forked.scala.html
new file mode 100644
index 0000000..4efe751
--- /dev/null
+++ b/src/main/twirl/repo/forked.scala.html
@@ -0,0 +1,28 @@
+@(members: service.RepositoryService.RepositoryTreeNode,
+  repository: service.RepositoryService.RepositoryInfo)(implicit context: app.Context)
+@import context._
+@import view.helpers._
+@html.main(s"${repository.owner}/${repository.name}", Some(repository)) {
+  <ul class="nav nav-tabs">
+    <li class="active"><a href="@url(repository)/network/members">Members</a></li>
+  </ul>
+  <h3>Members of the @repository.name Network</h3>
+  <ul>
+    @renderTree(members)
+  </ul>
+}
+
+@renderTree(node: service.RepositoryService.RepositoryTreeNode) = {
+  <li>
+    <div style="font-size: 120%; margin-bottom: 8px;">
+      @avatar(node.owner, 20) <a href="@url(node.owner)">@node.owner</a> / <a href="@path/@node.owner/@node.name">@node.name</a>
+    </div>
+    @if(node.children.nonEmpty){
+      <ul>
+        @node.children.map { child =>
+          @renderTree(child)
+        }
+      </ul>
+    }
+  </li>
+}
\ No newline at end of file
diff --git a/src/main/webapp/assets/common/css/gitbucket.css b/src/main/webapp/assets/common/css/gitbucket.css
index 44e1f10..b01b48a 100644
--- a/src/main/webapp/assets/common/css/gitbucket.css
+++ b/src/main/webapp/assets/common/css/gitbucket.css
@@ -70,6 +70,19 @@
   text-decoration: none;
 }
 
+div.input-prepend span.add-on {
+  background-color: white;
+  -webkit-border-radius: 0 4px 4px 0;
+  -moz-border-radius: 0 4px 4px 0;
+  border-radius: 0 4px 4px 0;
+}
+
+/*
+div.input-prepend span.add-on a {
+  color: #333;
+}
+*/
+
 /* ======================================================================== */
 /* General Styles */
 /* ======================================================================== */