diff --git a/routers/web/repo/pull.go b/routers/web/repo/pull.go
index bb814eab6e..cd20c0b18e 100644
--- a/routers/web/repo/pull.go
+++ b/routers/web/repo/pull.go
@@ -348,6 +348,7 @@ func PrepareViewPullInfo(ctx *context.Context, issue *issues_model.Issue) *git.C
 	}
 
 	if !baseGitRepo.IsBranchExist(pull.BaseBranch) {
+		ctx.Data["BaseBranchNotExist"] = true
 		ctx.Data["IsPullRequestBroken"] = true
 		ctx.Data["BaseTarget"] = pull.BaseBranch
 		ctx.Data["HeadTarget"] = pull.HeadBranch
diff --git a/templates/repo/issue/view_content/comments.tmpl b/templates/repo/issue/view_content/comments.tmpl
index 477b6b33c6..47551c86e4 100644
--- a/templates/repo/issue/view_content/comments.tmpl
+++ b/templates/repo/issue/view_content/comments.tmpl
@@ -231,7 +231,8 @@
 				{{template "shared/user/avatarlink" dict "user" .Poster}}
 				<span class="text grey muted-links">
 					{{template "shared/user/authorlink" .Poster}}
-					{{ctx.Locale.Tr "repo.issues.delete_branch_at" .OldRef $createdStr}}
+					{{$oldRef := HTMLFormat `<span class="tw-line-through">%s</span>` .OldRef}}
+					{{ctx.Locale.Tr "repo.issues.delete_branch_at" $oldRef $createdStr}}
 				</span>
 			</div>
 		{{else if eq .Type 12}}
diff --git a/templates/repo/issue/view_title.tmpl b/templates/repo/issue/view_title.tmpl
index 26b36d6ffc..cf775f22b5 100644
--- a/templates/repo/issue/view_title.tmpl
+++ b/templates/repo/issue/view_title.tmpl
@@ -61,12 +61,16 @@
 					{{if .Issue.PullRequest.IsAgitFlow}}
 						{{$headHref = HTMLFormat `%s <a href="%s" target="_blank"><span class="ui label basic tiny" data-tooltip-content="%s">AGit</span></a>` $headHref "https://docs.gitea.com/usage/agit" (ctx.Locale.Tr "repo.pull.agit_documentation")}}
 					{{else}}
-						{{$headHref = HTMLFormat `<span data-tooltip-content="%s">%s</span>` (ctx.Locale.Tr "form.target_branch_not_exist") $headHref}}
+						{{$headHref = HTMLFormat `<span class="tw-line-through" data-tooltip-content="%s">%s</span>` (ctx.Locale.Tr "form.target_branch_not_exist") $headHref}}
 					{{end}}
 				{{end}}
 				{{$baseHref := .BaseTarget}}
 				{{if .BaseBranchLink}}
-					{{$baseHref = HTMLFormat `<a href="%s">%s</a>` .BaseBranchLink $baseHref}}
+					{{if .BaseBranchNotExist}}
+						{{$baseHref = HTMLFormat `<span class="tw-line-through" data-tooltip-content="%s">%s</span>` (ctx.Locale.Tr "form.target_branch_not_exist") $baseHref}}
+					{{else}}
+						{{$baseHref = HTMLFormat `<a href="%s">%s</a>` .BaseBranchLink $baseHref}}
+					{{end}}
 				{{end}}
 				{{if .Issue.PullRequest.HasMerged}}
 					{{$mergedStr:= DateUtils.TimeSince .Issue.PullRequest.MergedUnix}}
diff --git a/tests/integration/pull_merge_test.go b/tests/integration/pull_merge_test.go
index 2351e169bc..bbd99f7aab 100644
--- a/tests/integration/pull_merge_test.go
+++ b/tests/integration/pull_merge_test.go
@@ -589,7 +589,8 @@ func TestPullDontRetargetChildOnWrongRepo(t *testing.T) {
 		resp := session.MakeRequest(t, req, http.StatusOK)
 
 		htmlDoc := NewHTMLParser(t, resp.Body)
-		targetBranch := htmlDoc.doc.Find("#branch_target>a").Text()
+		// the branch has been deleted, so there is no a html tag instead of span
+		targetBranch := htmlDoc.doc.Find("#branch_target>span").Text()
 		prStatus := strings.TrimSpace(htmlDoc.doc.Find(".issue-title-meta>.issue-state-label").Text())
 
 		assert.EqualValues(t, "base-pr", targetBranch)