diff --git a/src/sql/ob_sql.cpp b/src/sql/ob_sql.cpp
index 4c1a5f0ef..ab1fec17d 100644
--- a/src/sql/ob_sql.cpp
+++ b/src/sql/ob_sql.cpp
@@ -173,6 +173,14 @@ void ObSql::stat()
        LOG_WARN("only DML stmt or SET command is supported to be executed on txn temporary node", \
                 KR(ret), K(stmt_type), K(session.get_txn_free_route_ctx()), K(session)); \
      }                                                                  \
+     ObPhysicalPlan* phy_plan = result.get_physical_plan();             \
+     if (OB_SUCCESS == ret && NULL != phy_plan) {                       \
+       if (phy_plan->has_link_table()) {                                \
+         ret = OB_TRANS_FREE_ROUTE_NOT_SUPPORTED;                       \
+         LOG_WARN("stmt with dblink can not be executed on txn temporary node", \
+                  KR(ret), K(stmt_type), K(session.get_txn_free_route_ctx()), K(session)); \
+       }                                                                \
+     }                                                                  \
    }                                                                    \
  }
 
diff --git a/src/storage/tx/ob_tx_free_route.cpp b/src/storage/tx/ob_tx_free_route.cpp
index b8154636d..970c5b7be 100644
--- a/src/storage/tx/ob_tx_free_route.cpp
+++ b/src/storage/tx/ob_tx_free_route.cpp
@@ -1100,6 +1100,9 @@ bool ObTransService::need_fallback_(ObTxDesc &tx, int64_t &total_size)
   if (tx.with_temporary_table()) {
     TRANS_LOG(TRACE, "with tx level temp-table");
     fallback = true;
+  } else if (tx.is_xa_trans() && tx.is_xa_tightly_couple()) {
+    TRANS_LOG(TRACE, "need fallback for tightly coupled xa trans");
+    fallback = true;
   } else {
     total_size = OB_E(EventTable::EN_TX_FREE_ROUTE_STATE_SIZE, tx.tx_id_) tx.estimate_state_size();
     if (total_size > MAX_STATE_SIZE) {