diff --git a/modules/repository/fork.go b/modules/repository/fork.go
index da9039d00..e3ebbfee2 100644
--- a/modules/repository/fork.go
+++ b/modules/repository/fork.go
@@ -86,5 +86,11 @@ func ForkRepository(doer, owner *models.User, oldRepo *models.Repository, name,
 	if err := models.CopyLanguageStat(oldRepo, repo); err != nil {
 		log.Error("Copy language stat from oldRepo failed")
 	}
+	//inherit parent repo's topics
+	if len(oldRepo.Topics) > 0 {
+		if err := models.SaveTopics(repo.ID, oldRepo.Topics...); err != nil {
+			log.Error("SaveTopics failed when fork,e=%v", err)
+		}
+	}
 	return repo, models.CopyLFS(ctx, repo, oldRepo)
 }