diff --git a/src/common/backend/utils/adt/misc.cpp b/src/common/backend/utils/adt/misc.cpp
index ae28ec222..3791121b2 100755
--- a/src/common/backend/utils/adt/misc.cpp
+++ b/src/common/backend/utils/adt/misc.cpp
@@ -47,7 +47,7 @@
 #include "pgxc/pgxc.h"
 #endif
 
-extern void cancel_backend(Oid pid);
+extern void cancel_backend(ThreadId pid);
 #define atooid(x) ((Oid)strtoul((x), NULL, 10))
 
 /*
@@ -924,7 +924,7 @@ Datum pg_test_err_contain_err(PG_FUNCTION_ARGS)
 
 // Signal to cancel a backend process. This is allowed if you are superuser
 // or have the same role as the process being canceled.
-void cancel_backend(Oid pid)
+void cancel_backend(ThreadId pid)
 {
     int sig_return = 0;
 
diff --git a/src/gausskernel/optimizer/commands/user.cpp b/src/gausskernel/optimizer/commands/user.cpp
index b321b68bc..25808ccde 100755
--- a/src/gausskernel/optimizer/commands/user.cpp
+++ b/src/gausskernel/optimizer/commands/user.cpp
@@ -100,7 +100,7 @@ static List* GetCancelQuery(const char* user_name);
 static bool IsEligiblePid(Oid rel_oid, Oid nsp_oid, Oid pid, Oid db_oid, Form_pg_class form, List* query_list);
 static bool IsDuplicatePid(const List* query_list, Oid pid);
 static void CancelQuery(const char* user_name);
-extern void cancel_backend(Oid pid);
+extern void cancel_backend(ThreadId pid);
 static bool IsCurrentSchemaAttachRoles(List* roles);
 
 /* Database Security: Support password complexity */
diff --git a/src/include/commands/user.h b/src/include/commands/user.h
index e0b7fabac..c820ac802 100755
--- a/src/include/commands/user.h
+++ b/src/include/commands/user.h
@@ -18,7 +18,7 @@
 #define PASSWORD_TYPE_PLAINTEXT 0
 #define PASSWORD_TYPE_MD5 1
 typedef struct LockInfoBuck {
-    Oid pid;
+    ThreadId pid;
     Oid relation;
     Oid database;
     Oid nspoid;