diff --git a/models/repo_list.go b/models/repo_list.go
index 57b6ebbd6..928e1f953 100755
--- a/models/repo_list.go
+++ b/models/repo_list.go
@@ -166,6 +166,8 @@ type SearchRepoOptions struct {
 	Archived util.OptionalBool
 	// only search topic name
 	TopicOnly bool
+	//search by Specific TopicName
+	TopicName string
 	// include description in keyword search
 	IncludeDescription bool
 	// None -> include has milestones AND has no milestone
@@ -327,6 +329,18 @@ func SearchRepositoryCondition(opts *SearchRepoOptions) builder.Cond {
 		}
 		cond = cond.And(keywordCond)
 	}
+	if opts.TopicName != "" {
+		var subQueryCond = builder.NewCond()
+		subQueryCond = subQueryCond.Or(builder.Eq{"topic.name": opts.TopicName})
+		subQuery := builder.Select("repo_topic.repo_id").From("repo_topic").
+			Join("INNER", "topic", "topic.id = repo_topic.topic_id").
+			Where(subQueryCond).
+			GroupBy("repo_topic.repo_id")
+
+		var topicNameCond = builder.In("id", subQuery)
+		cond = cond.And(topicNameCond)
+
+	}
 
 	if opts.Fork != util.OptionalBoolNone {
 		cond = cond.And(builder.Eq{"is_fork": opts.Fork == util.OptionalBoolTrue})
diff --git a/options/locale/locale_en-US.ini b/options/locale/locale_en-US.ini
index 464542cc7..7f70f4c03 100644
--- a/options/locale/locale_en-US.ini
+++ b/options/locale/locale_en-US.ini
@@ -87,7 +87,7 @@ write = Write
 preview = Preview
 loading = Loading…
 
-error404_index = Request forbidden by administrative rules 
+error404_index = Request forbidden by administrative rules
 error500_index = Internal Server Error
 error404 = The page you are trying to reach either <strong>does not exist</strong> or <strong>you are not authorized</strong> to view it.
 error500= Sorry, the site has encountered some problems, we are trying to <strong>fix the page</strong>, please try again later.
@@ -1246,6 +1246,11 @@ pulls.reject_count_1 = "%d change request"
 pulls.reject_count_n = "%d change requests"
 pulls.waiting_count_1 = "%d waiting review"
 pulls.waiting_count_n = "%d waiting reviews"
+pulls.commits_count_1=This branch is %d commit behind the upstream.
+pulls.commits_count_n=This branch is %d commit behind the upstream.
+pulls.fetch_upstream=Fetch upstream
+pulls.upstream_up_to_date=No new commits to fetch
+pulls.upstream_error=Cannot get upstream info
 
 pulls.no_merge_desc = This pull request cannot be merged because all repository merge options are disabled.
 pulls.no_merge_helper = Enable merge options in the repository settings or merge the pull request manually.
diff --git a/options/locale/locale_zh-CN.ini b/options/locale/locale_zh-CN.ini
index b8f416a35..0021437fb 100755
--- a/options/locale/locale_zh-CN.ini
+++ b/options/locale/locale_zh-CN.ini
@@ -1248,6 +1248,11 @@ pulls.reject_count_1=%d 变更请求
 pulls.reject_count_n=%d 变更请求
 pulls.waiting_count_1=%d 个正在等待审核
 pulls.waiting_count_n=%d 个正在等待审核
+pulls.commits_count_1=当前分支落后上游分支 %d 个提交
+pulls.commits_count_n=当前分支落后上游分支 %d 个提交
+pulls.fetch_upstream=拉取上游更新
+pulls.upstream_up_to_date=上游分支没有新的更新
+pulls.upstream_error=获取上游分支信息错误
 
 pulls.no_merge_desc=由于未启用合并选项，此合并请求无法被合并。
 pulls.no_merge_helper=在项目设置中启用合并选项或者手工合并请求。
diff --git a/routers/home.go b/routers/home.go
index a1c07e317..70fea437c 100755
--- a/routers/home.go
+++ b/routers/home.go
@@ -149,8 +149,7 @@ func RenderRepoSearch(ctx *context.Context, opts *RepoSearchOptions) {
 
 	//todo:support other topics
 	keyword := strings.Trim(ctx.Query("q"), " ")
-	topicOnly := ctx.QueryBool("topic")
-	ctx.Data["TopicOnly"] = topicOnly
+	topic := strings.Trim(ctx.Query("topic"), " ")
 
 	repos, count, err = models.SearchRepository(&models.SearchRepoOptions{
 		ListOptions: models.ListOptions{
@@ -164,7 +163,7 @@ func RenderRepoSearch(ctx *context.Context, opts *RepoSearchOptions) {
 		OwnerID:            opts.OwnerID,
 		AllPublic:          true,
 		AllLimited:         true,
-		TopicOnly:          topicOnly,
+		TopicName:          topic,
 		IncludeDescription: setting.UI.SearchRepoDescription,
 	})
 	if err != nil {
@@ -177,6 +176,8 @@ func RenderRepoSearch(ctx *context.Context, opts *RepoSearchOptions) {
 		repo.Active = int64(repo.NumIssues) + int64(repo.NumPulls) + int64(repo.NumCommit)
 	}
 	ctx.Data["Keyword"] = keyword
+	ctx.Data["Topic"] = topic
+
 	ctx.Data["Total"] = count
 	ctx.Data["Repos"] = repos
 	ctx.Data["IsRepoIndexerEnabled"] = setting.Indexer.RepoIndexerEnabled
diff --git a/routers/repo/view.go b/routers/repo/view.go
index 1546f53b7..0d284c42b 100644
--- a/routers/repo/view.go
+++ b/routers/repo/view.go
@@ -790,6 +790,44 @@ func renderCode(ctx *context.Context) {
 		}
 	}
 
+	//如果是fork的仓库
+	if ctx.Repo.Repository.IsFork {
+		//获得fetchUpstream对应的分支参数
+		/*
+			// 1. /{:baseOwner}/{:baseRepoName}/compare/{:baseBranch}...{:headBranch}
+			// 2. /{:baseOwner}/{:baseRepoName}/compare/{:baseBranch}...{:headOwner}:{:headBranch}
+			// 3. /{:baseOwner}/{:baseRepoName}/compare/{:baseBranch}...{:headOwner}/{:headRepoName}:{:headBranch}
+		*/
+		baseGitRepo, err := git.OpenRepository(ctx.Repo.Repository.BaseRepo.RepoPath())
+		defer baseGitRepo.Close()
+		if err != nil {
+			log.Error("error open baseRepo:%s",ctx.Repo.Repository.BaseRepo.RepoPath())
+			ctx.Data["FetchUpstreamCnt"] = -1 // minus value indicates error
+		}else{
+			if _,error:= baseGitRepo.GetBranch(ctx.Repo.BranchName);error==nil{
+				//base repo has the same branch, then compare between current repo branch and base repo's branch
+				compareUrl :=  ctx.Repo.BranchName + "..." + ctx.Repo.Repository.BaseRepo.OwnerName +  "/" + ctx.Repo.Repository.BaseRepo.Name + ":" + ctx.Repo.BranchName
+				ctx.SetParams("*",compareUrl)
+			}else{
+				//else, compare between current repo branch and base repo's default branch
+				compareUrl :=  ctx.Repo.BranchName + "..." + ctx.Repo.Repository.BaseRepo.OwnerName +  "/" + ctx.Repo.Repository.BaseRepo.Name + ":" + ctx.Repo.Repository.BaseRepo.DefaultBranch
+				ctx.SetParams("*",compareUrl)
+			}
+			_, _, headGitRepo, compareInfo, _, _ := ParseCompareInfo(ctx)
+			defer headGitRepo.Close()
+			if compareInfo!= nil {
+				if compareInfo.Commits!=nil {
+					log.Info("compareInfoCommits数量:%d",compareInfo.Commits.Len())
+					ctx.Data["FetchUpstreamCnt"] = compareInfo.Commits.Len()
+				}else{
+					log.Info("compareInfo nothing different")
+					ctx.Data["FetchUpstreamCnt"] = 0
+				}
+			}else{
+				ctx.Data["FetchUpstreamCnt"] = -1 // minus value indicates error
+			}
+		}
+	}
 	ctx.Data["Paths"] = paths
 	ctx.Data["TreeLink"] = treeLink
 	ctx.Data["TreeNames"] = treeNames
diff --git a/templates/repo/home.tmpl b/templates/repo/home.tmpl
index 24f7255a6..8d52f9115 100644
--- a/templates/repo/home.tmpl
+++ b/templates/repo/home.tmpl
@@ -154,6 +154,21 @@
 						<a href="{{.BaseRepo.Link}}/compare/{{.BaseRepo.DefaultBranch | EscapePound}}...{{if ne .Repository.Owner.Name .BaseRepo.Owner.Name}}{{.Repository.Owner.Name}}:{{end}}{{.BranchName | EscapePound}}">
 							<button id="new-pull-request" class="ui compact basic button">{{if .PullRequestCtx.Allowed}}{{.i18n.Tr "repo.pulls.compare_changes"}}{{else}}{{.i18n.Tr "action.compare_branch"}}{{end}}</button>
 						</a>
+						{{if and .Repository.IsFork .PullRequestCtx.Allowed}}
+							{{if gt .FetchUpstreamCnt 0 }}
+								<a href="{{.Repository.Link}}/compare/{{.BranchName | EscapePound}}...{{.BaseRepo.Owner.Name}}:{{.BaseRepo.DefaultBranch | EscapePound}}">
+									<button id="new-pull-request" class="ui compact basic button" title="{{$.i18n.Tr (TrN $.i18n.Lang .FetchUpstreamCnt "repo.pulls.commits_count_1" "repo.pulls.commits_count_n") .FetchUpstreamCnt}}">{{.i18n.Tr "repo.pulls.fetch_upstream"}}</button>
+								</a>
+							{{else if lt .FetchUpstreamCnt 0}}
+								<a href="{{.Repository.Link}}/compare/{{.BranchName | EscapePound}}...{{.BaseRepo.Owner.Name}}:{{.BaseRepo.DefaultBranch | EscapePound}}">
+									<button id="new-pull-request" class="ui compact basic button" title="{{.i18n.Tr "repo.pulls.upstream_error"}}">{{.i18n.Tr "repo.pulls.fetch_upstream"}}</button>
+								</a>
+							{{else}}
+								<a href="{{.Repository.Link}}/compare/{{.BranchName | EscapePound}}...{{.BaseRepo.Owner.Name}}:{{.BaseRepo.DefaultBranch | EscapePound}}">
+									<button id="new-pull-request" class="ui compact basic button" title="{{.i18n.Tr "repo.pulls.upstream_up_to_date"}}">{{.i18n.Tr "repo.pulls.fetch_upstream"}}</button>
+								</a>
+							{{end}}
+						{{end}}
 					</div>
 				{{end}}
 			{{else}}
diff --git a/templates/repo/issue/list.tmpl b/templates/repo/issue/list.tmpl
index a99205eea..e7cb8b19f 100644
--- a/templates/repo/issue/list.tmpl
+++ b/templates/repo/issue/list.tmpl
@@ -3,12 +3,7 @@
 	{{template "repo/header" .}}
 	<div class="ui container">
 		<div class="ui three column stackable grid">
-			<div class="column" style="display: flex;align-items: center;">
-					<div class="ui large breadcrumb">
-							<a href="{{.RepoLink}}/issues">{{.i18n.Tr "repo.issues"}}</a>
-							<div class="divider"> / </div>
-							
-					</div>
+			<div class="column" style="display: flex;align-items: center;">					
 			</div>
 			<div class="column center aligned">
 				{{template "repo/issue/search" .}}
diff --git a/web_src/js/components/EditTopics.vue b/web_src/js/components/EditTopics.vue
index c946dff47..5c452d76a 100644
--- a/web_src/js/components/EditTopics.vue
+++ b/web_src/js/components/EditTopics.vue
@@ -197,13 +197,13 @@ export default {
         })
     },
     postTopic(){
-        const patter = /^[\u4e00-\u9fa5a-z0-9][\u4e00-\u9fa5a-zA-Z0-9-]{0,35}$/
+        const patter = /^[\u4e00-\u9fa5a-zA-Z0-9][\u4e00-\u9fa5a-zA-Z0-9-]{0,34}$/
         let regexp = patter.test(this.input)
         console.log("regexp",regexp)
         if(!regexp){
             this.$notify({
                 
-                message: '主题必须以中文、字母或数字开头，可以包含连字符 (-)，并且长度不得超过35个字符',
+                message: '标签名必须以中文、字母或数字开头，可以包含连字符 (-)，并且长度不得超过35个字符',
                 duration: 3000,
                 type:'error'
                 });