diff --git a/kernel/treenode/blocktree.go b/kernel/treenode/blocktree.go
index c0b0b89e2..06bc2f08c 100644
--- a/kernel/treenode/blocktree.go
+++ b/kernel/treenode/blocktree.go
@@ -90,6 +90,11 @@ func initDBTables() {
 	if err != nil {
 		logging.LogFatalf(logging.ExitCodeUnavailableDatabase, "create index [idx_blocktrees_id] failed: %s", err)
 	}
+
+	_, err = db.Exec("CREATE INDEX idx_blocktrees_root_id ON blocktrees(root_id)")
+	if err != nil {
+		logging.LogFatalf(logging.ExitCodeUnavailableDatabase, "create index [idx_blocktrees_id] failed: %s", err)
+	}
 }
 
 func initDBConnection() {