diff --git a/src/interface/dms_api.h b/src/interface/dms_api.h
index 9119d0f50f888b28e8189ef1d5501b56be4ac00a..2db37b43cff617c7fb6f7e928adf2077f029a48a 100644
--- a/src/interface/dms_api.h
+++ b/src/interface/dms_api.h
@@ -36,7 +36,7 @@ extern "C" {
 #define DMS_LOCAL_MINOR_VER_WEIGHT  1000
 #define DMS_LOCAL_MAJOR_VERSION     0
 #define DMS_LOCAL_MINOR_VERSION     0
-#define DMS_LOCAL_VERSION           177
+#define DMS_LOCAL_VERSION           178
 
 #define DMS_SUCCESS 0
 #define DMS_ERROR (-1)
@@ -1005,6 +1005,7 @@ typedef int (*dms_az_switchover_demote_approve)(void *db_handle);
 typedef int (*dms_az_switchover_demote_phase2)(void *db_handle);
 typedef int (*dms_az_switchover_promote_prepare)(void *db_handle);
 typedef int (*dms_az_switchover_promote_phase1)(void *db_handle);
+typedef int (*dms_az_switchover_promote_switch_log)(void *db_handle);
 typedef int (*dms_az_switchover_promote_phase2)(void *db_handle);
 typedef int (*dms_az_promote_success)(void *db_handle);
 typedef void (*dms_dyn_log)(void *db_handle, long long dyn_log_time);
@@ -1217,6 +1218,7 @@ typedef struct st_dms_callback {
     dms_az_switchover_demote_phase2 az_switchover_demote_phase2;
     dms_az_switchover_promote_prepare az_switchover_promote_prepare;
     dms_az_switchover_promote_phase1 az_switchover_promote_phase1;
+    dms_az_switchover_promote_switch_log az_switchover_promote_switch_log;
     dms_az_switchover_promote_phase2 az_switchover_promote_phase2;
     dms_az_promote_success az_promote_success;
     dms_az_failover_promote_phase1 az_failover_promote_phase1;
diff --git a/src/rc/dms_reform.h b/src/rc/dms_reform.h
index 59d7b92297844212b5b6d22913afa16440e462c6..758c698dcb16c0684f1ee87513638fda5c4d554f 100644
--- a/src/rc/dms_reform.h
+++ b/src/rc/dms_reform.h
@@ -190,8 +190,8 @@ typedef enum en_reform_step {
     DMS_REFORM_STEP_RELOAD_TXN,
 
     DMS_REFORM_STEP_SYNC_NODE_LFN,
+    DMS_REFORM_STEP_AZ_SWITCH_PROMOTE_SWITCH_LOG,   // for Gauss100, AZ SWITCHOVER standby to primary
     DMS_REFORM_STEP_AZ_PROMOTE_SUCCESS,
-
     DMS_REFORM_STEP_COUNT
 } reform_step_t;
 
diff --git a/src/rc/dms_reform_judge_switch.c b/src/rc/dms_reform_judge_switch.c
index f68f7ba33f673f583f83191713e9a8673cda7ab8..45275df5fb0414f818bca4d6bceab6f77a282057 100644
--- a/src/rc/dms_reform_judge_switch.c
+++ b/src/rc/dms_reform_judge_switch.c
@@ -78,6 +78,8 @@ void dms_reform_judgement_az_promote_phase1(void)
     dms_reform_add_step(DMS_REFORM_STEP_AZ_SWITCH_PROMOTE_PREPARE);
     dms_reform_add_step(DMS_REFORM_STEP_SYNC_WAIT);
     dms_reform_add_step(DMS_REFORM_STEP_AZ_SWITCH_PROMOTE_PHASE1);
+    dms_reform_add_step(DMS_REFORM_STEP_SYNC_WAIT);
+    dms_reform_add_step(DMS_REFORM_STEP_AZ_SWITCH_PROMOTE_SWITCH_LOG);
     share_info->promote_id = (uint8)g_dms.inst_id;
 }
 
@@ -104,6 +106,8 @@ void dms_reform_judgement_az_failover_promote_phase1(void)
     }
     dms_reform_add_step(DMS_REFORM_STEP_SYNC_WAIT);
     dms_reform_add_step(DMS_REFORM_STEP_AZ_FAILOVER_PROMOTE_PHASE1);
+    dms_reform_add_step(DMS_REFORM_STEP_SYNC_WAIT);
+    dms_reform_add_step(DMS_REFORM_STEP_AZ_SWITCH_PROMOTE_SWITCH_LOG);
     share_info->promote_id = (uint8)g_dms.inst_id;
 }
 
diff --git a/src/rc/dms_reform_proc.c b/src/rc/dms_reform_proc.c
index 083f9b44fdaa96b278172090745246550bd11793..f93c2d2d07c8a83d134a0c263c7966204b44073f 100644
--- a/src/rc/dms_reform_proc.c
+++ b/src/rc/dms_reform_proc.c
@@ -433,6 +433,22 @@ static int dms_reform_az_switchover_promote_phase1(void)
     return DMS_SUCCESS;
 }
 
+static int dms_reform_az_switchover_promote_switch_log(void)
+{
+    int ret = DMS_SUCCESS;
+
+    LOG_RUN_FUNC_ENTER;
+    ret = g_dms.callback.az_switchover_promote_switch_log(g_dms.reform_ctx.handle_normal);
+    if (ret != DMS_SUCCESS) {
+        LOG_RUN_FUNC_FAIL;
+        return ret;
+    }
+
+    LOG_RUN_FUNC_SUCCESS;
+    dms_reform_next_step();
+    return DMS_SUCCESS;
+}
+
 static int dms_reform_az_switchover_promote_phase2(void)
 {
     int ret = DMS_SUCCESS;
@@ -2003,6 +2019,8 @@ dms_reform_proc_t g_dms_reform_procs[DMS_REFORM_STEP_COUNT] = {
         dms_reform_az_failover_promote_phase2, NULL, CM_FALSE },
     [DMS_REFORM_STEP_RELOAD_TXN] = { "RELOAD_TXN", dms_reform_reload_txn, NULL, CM_FALSE },
     [DMS_REFORM_STEP_SYNC_NODE_LFN] = { "SYNC_NODE_LFN", dms_reform_sync_node_lfn, NULL, CM_FALSE },
+    [DMS_REFORM_STEP_AZ_SWITCH_PROMOTE_SWITCH_LOG] = { "AZ_SWITCH_PROMOTE_SWITCH_LOG",
+        dms_reform_az_switchover_promote_switch_log, NULL, CM_FALSE },
 };
 
 static int dms_reform_proc_inner(void)
diff --git a/src/rc/dms_reform_proc_stat.c b/src/rc/dms_reform_proc_stat.c
index 6e7231724bbfce7c0eb145aec38a4d4358767d40..9bb1574347ace07484081fdf6fdd8231b588bd15 100644
--- a/src/rc/dms_reform_proc_stat.c
+++ b/src/rc/dms_reform_proc_stat.c
@@ -275,6 +275,7 @@ drps_desc_t g_drps_desc_t[] = {
     {DMS_REFORM_STEP_AZ_FAILOVER_PROMOTE_PHASE2,                DRPS_LEVEL_TOP,     "AZ_FAILOVER_PROMOTE_PHASE2"},
     {DMS_REFORM_STEP_RELOAD_TXN,                                DRPS_LEVEL_TOP,     "RELOAD_TXN"},
     {DMS_REFORM_STEP_SYNC_NODE_LFN,                             DRPS_LEVEL_TOP,     "SYNC_NODE_LFN"},
+    {DMS_REFORM_STEP_AZ_SWITCH_PROMOTE_SWITCH_LOG,              DRPS_LEVEL_TOP,     "AZ_SWITCH_PROMOTE_SWITCH_LOG"},
 };