diff --git a/include/util/taoserror.h b/include/util/taoserror.h
index 3669348a1842fecd82758d02aa7a1367d6cc70af..be82e14708137796d8d91836b5191948f883e867 100644
--- a/include/util/taoserror.h
+++ b/include/util/taoserror.h
@@ -183,8 +183,7 @@ int32_t* taosGetErrno();
 #define TSDB_CODE_MND_BNODE_NOT_EXIST           TAOS_DEF_ERROR_CODE(0, 0x0357)
 #define TSDB_CODE_MND_TOO_FEW_MNODES            TAOS_DEF_ERROR_CODE(0, 0x0358)
 #define TSDB_CODE_MND_TOO_MANY_MNODES           TAOS_DEF_ERROR_CODE(0, 0x0359)
-#define TSDB_CODE_MND_MNODE_DEPLOYED            TAOS_DEF_ERROR_CODE(0, 0x035A)
-#define TSDB_CODE_MND_CANT_DROP_MASTER          TAOS_DEF_ERROR_CODE(0, 0x035B)
+#define TSDB_CODE_MND_CANT_DROP_MASTER          TAOS_DEF_ERROR_CODE(0, 0x035A)
 
 // mnode-acct
 #define TSDB_CODE_MND_ACCT_ALREADY_EXIST        TAOS_DEF_ERROR_CODE(0, 0x0360)
diff --git a/source/dnode/mnode/impl/src/mndDnode.c b/source/dnode/mnode/impl/src/mndDnode.c
index 73d7eff04a03a6738f4b2b597a3b7c08b39bfb68..aeff018aa82da7216e21bb46270a6bbb8c3ead7a 100644
--- a/source/dnode/mnode/impl/src/mndDnode.c
+++ b/source/dnode/mnode/impl/src/mndDnode.c
@@ -613,7 +613,7 @@ static int32_t mndProcessDropDnodeReq(SRpcMsg *pReq) {
 
   pMObj = mndAcquireMnode(pMnode, dropReq.dnodeId);
   if (pMObj != NULL) {
-    terrno = TSDB_CODE_MND_MNODE_DEPLOYED;
+    terrno = TSDB_CODE_MND_MNODE_NOT_EXIST;
     goto DROP_DNODE_OVER;
   }
 
diff --git a/source/util/src/terror.c b/source/util/src/terror.c
index a54d8c2c03487d81a487350ea9261608136233f6..c1f5c92be78b1bbb6c6adb504cb0729d1b40919c 100644
--- a/source/util/src/terror.c
+++ b/source/util/src/terror.c
@@ -186,10 +186,9 @@ TAOS_DEFINE_ERROR(TSDB_CODE_MND_SNODE_ALREADY_EXIST,      "Snode already exists"
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_SNODE_NOT_EXIST,          "Snode not there")
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_BNODE_ALREADY_EXIST,      "Bnode already exists")
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_BNODE_NOT_EXIST,          "Bnode not there")
-TAOS_DEFINE_ERROR(TSDB_CODE_MND_TOO_FEW_MNODES,           "Too few mnodes")
-TAOS_DEFINE_ERROR(TSDB_CODE_MND_TOO_MANY_MNODES,          "Too many mnodes")
-TAOS_DEFINE_ERROR(TSDB_CODE_MND_MNODE_DEPLOYED,           "Mnode deployed in this dnode")
-TAOS_DEFINE_ERROR(TSDB_CODE_MND_CANT_DROP_MASTER,         "Can't drop mnode which is master")
+TAOS_DEFINE_ERROR(TSDB_CODE_MND_TOO_FEW_MNODES,           "The replicas of mnode cannot less than 1")
+TAOS_DEFINE_ERROR(TSDB_CODE_MND_TOO_MANY_MNODES,          "The replicas of mnode cannot exceed 3")
+TAOS_DEFINE_ERROR(TSDB_CODE_MND_CANT_DROP_MASTER,         "Can't drop mnode which is LEADER")
 
 // mnode-acct
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_ACCT_ALREADY_EXIST,       "Account already exists")