diff --git a/src/storage/tx/ob_trans_define_v4.cpp b/src/storage/tx/ob_trans_define_v4.cpp
index d1c8b2bb54..95ae23dd64 100644
--- a/src/storage/tx/ob_trans_define_v4.cpp
+++ b/src/storage/tx/ob_trans_define_v4.cpp
@@ -194,6 +194,80 @@ OB_SERIALIZE_MEMBER(ObTxReadSnapshot,
                     parts_,
                     snapshot_ls_role_);
 OB_SERIALIZE_MEMBER(ObTxPart, id_, addr_, epoch_, first_scn_, last_scn_);
+
+DEFINE_SERIALIZE(ObTxDesc::FLAG::FOR_FIXED_SER_VAL)
+{
+  int ret = OB_SUCCESS;
+  return serialization::encode_i64(buf, buf_len, pos, v_);
+}
+DEFINE_DESERIALIZE(ObTxDesc::FLAG::FOR_FIXED_SER_VAL)
+{
+  int ret = OB_SUCCESS;
+  return serialization::decode_i64(buf, data_len, pos, (int64_t*)&v_);
+}
+DEFINE_GET_SERIALIZE_SIZE(ObTxDesc::FLAG::FOR_FIXED_SER_VAL)
+{
+  return serialization::encoded_length_i64(v_);
+}
+
+uint64_t ObTxDesc::FLAG::COMPAT_FOR_EXEC::get_serialize_v_() const
+{
+  FLAG ret_flag;
+  FLAG this_flag;
+  this_flag.compat_for_exec_.v_ = v_;
+  ret_flag.compat_for_exec_.v_ = 0;
+#define _SET_FLAG_(x) ret_flag.x = this_flag.x
+  LST_DO(_SET_FLAG_, (;),
+         EXPLICIT_,
+         SHADOW_,
+         REPLICA_,
+         TRACING_);
+#undef _SET_FLAG_
+  return ret_flag.compat_for_exec_.v_;
+}
+
+uint64_t ObTxDesc::FLAG::COMPAT_FOR_TX_ROUTE::get_serialize_v_() const
+{
+  FLAG ret_flag;
+  FLAG this_flag;
+  this_flag.compat_for_tx_route_.v_ = v_;
+  ret_flag.compat_for_tx_route_.v_ = 0;
+#define _SET_FLAG_(x) ret_flag.x = this_flag.x
+  LST_DO(_SET_FLAG_, (;),
+         EXPLICIT_,
+         SHADOW_,
+         REPLICA_,
+         TRACING_,
+         RELEASED_,
+         PARTS_INCOMPLETE_,
+         PART_EPOCH_MISMATCH_,
+         WITH_TEMP_TABLE_,
+         DEFER_ABORT_);
+#undef _SET_FLAG_
+  return ret_flag.compat_for_tx_route_.v_;
+}
+
+#define DEF_SERIALIZE_COMPAT_FOR_TX_DESC_FLAG(THE_TYPE) \
+  DEFINE_SERIALIZE(ObTxDesc::FLAG::THE_TYPE)     \
+  {                                              \
+    int ret = OB_SUCCESS;                                               \
+    const uint64_t compat_v = get_serialize_v_();                       \
+    return serialization::encode_vi64(buf, buf_len, pos, compat_v);     \
+  }                                                                     \
+  DEFINE_DESERIALIZE(ObTxDesc::FLAG::THE_TYPE)                          \
+  {                                                                     \
+    int ret = OB_SUCCESS;                                               \
+    return serialization::decode_vi64(buf, data_len, pos, (int64_t*)&v_); \
+  }                                                                     \
+  DEFINE_GET_SERIALIZE_SIZE(ObTxDesc::FLAG::THE_TYPE)                   \
+  {                                                                     \
+    const uint64_t compat_v = get_serialize_v_();                       \
+    return serialization::encoded_length_vi64(compat_v);                \
+  }
+
+DEF_SERIALIZE_COMPAT_FOR_TX_DESC_FLAG(COMPAT_FOR_EXEC)
+DEF_SERIALIZE_COMPAT_FOR_TX_DESC_FLAG(COMPAT_FOR_TX_ROUTE)
+
 OB_SERIALIZE_MEMBER(ObTxDesc,
                     tenant_id_,
                     cluster_id_,
@@ -205,14 +279,15 @@ OB_SERIALIZE_MEMBER(ObTxDesc,
                     access_mode_,
                     op_sn_,
                     state_,
-                    flags_.v_,
+                    flags_.compat_for_exec_,
                     expire_ts_,
                     active_ts_,
                     timeout_us_,
                     lock_timeout_us_,
                     active_scn_,
                     parts_,
-                    xid_);
+                    xid_,
+                    flags_.for_serialize_v_);
 OB_SERIALIZE_MEMBER(ObTxParam,
                     timeout_us_,
                     lock_timeout_us_,
diff --git a/src/storage/tx/ob_trans_define_v4.h b/src/storage/tx/ob_trans_define_v4.h
index 5b95c3e0d0..b3e8332c18 100644
--- a/src/storage/tx/ob_trans_define_v4.h
+++ b/src/storage/tx/ob_trans_define_v4.h
@@ -425,9 +425,25 @@ protected:
   union FLAG                         // flags
   {
     uint64_t v_;
+    struct FOR_FIXED_SER_VAL {
+      uint64_t v_;
+      TO_STRING_KV(K_(v));
+      NEED_SERIALIZE_AND_DESERIALIZE;
+    } for_serialize_v_;
+    struct COMPAT_FOR_TX_ROUTE {
+      uint64_t v_;
+      uint64_t get_serialize_v_() const;
+      TO_STRING_KV(K_(v));
+      NEED_SERIALIZE_AND_DESERIALIZE;
+    } compat_for_tx_route_;
+    struct COMPAT_FOR_EXEC {
+      uint64_t v_;
+      uint64_t get_serialize_v_() const;
+      NEED_SERIALIZE_AND_DESERIALIZE;
+    } compat_for_exec_;
     struct
     {
-      bool EXPLICIT_:1;               // txn is explicted start
+      bool EXPLICIT_:1;              // txn is explicted start
       bool SHADOW_:1;                // this tx desc is a shadow copy, is not registered with tx_desc_mgr
       bool REPLICA_:1;               // a replica of primary/original, its state is transient, without whole lifecyle
       bool TRACING_:1;               // tracing the Tx
@@ -443,6 +459,7 @@ protected:
     void switch_to_idle_();
     FLAG update_with(const FLAG &flag);
   } flags_;
+  static_assert(sizeof(FLAG) == sizeof(int64_t), "ObTxDesc::FLAG should sizeof(int64_t)");
   union STATE_CHANGE_FLAG
   {
     uint8_t v_;
diff --git a/src/storage/tx/ob_tx_free_route_state.cpp b/src/storage/tx/ob_tx_free_route_state.cpp
index f6892e0316..184e9406ff 100644
--- a/src/storage/tx/ob_tx_free_route_state.cpp
+++ b/src/storage/tx/ob_tx_free_route_state.cpp
@@ -97,11 +97,12 @@ TXN_FREE_ROUTE_MEMBERS(static, PRE_STATIC_DECODE, POST_STATIC_DECODE,
 TXN_FREE_ROUTE_MEMBERS(dynamic,PRE_DYNAMIC_DECODE, POST_DYNAMIC_DECODE,
                        op_sn_,
                        state_,
-                       flags_.v_,
+                       flags_.compat_for_tx_route_,
                        active_ts_,
                        active_scn_,
                        abort_cause_,
-                       can_elr_);
+                       can_elr_,
+                       flags_.for_serialize_v_);
 TXN_FREE_ROUTE_MEMBERS(parts,,,
                        parts_);
 // the fields 'dup with static' are required when preceding of txn is of query like