diff --git a/src/common/pl/plpgsql/src/gram.y b/src/common/pl/plpgsql/src/gram.y
index 35437a5d9..2aa7e4487 100755
--- a/src/common/pl/plpgsql/src/gram.y
+++ b/src/common/pl/plpgsql/src/gram.y
@@ -479,7 +479,9 @@ static bool need_build_row_for_func_arg(PLpgSQL_rec **rec, PLpgSQL_row **row, in
 %token <keyword>	K_INTERSECT
 %token <keyword>	K_INTO
 %token <keyword>	K_IS
+%token <keyword>        K_ITERATE
 %token <keyword>	K_LAST
+%token <keyword>        K_LEAVE
 %token <keyword>	K_LIMIT
 %token <keyword>	K_LOG
 %token <keyword>	K_LOOP
@@ -2731,6 +2733,32 @@ stmt_loop		: opt_block_label K_LOOP loop_body
                         /* register the stmt if it is labeled */
                         record_stmt_label($1, (PLpgSQL_stmt *)newp);
                     }
+                | ':' K_LOOP loop_body
+                    {
+                        /*
+                         * When the database is in mysql compatible mode
+                         * support "label: loop"
+                         */
+                        if(u_sess->attr.attr_sql.sql_compatibility != B_FORMAT)
+                            ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+                                errmsg("'label:' is only supported in database which dbcompatibility='B'.")));
+
+                        PLpgSQL_stmt_loop  *newp;
+                        newp = (PLpgSQL_stmt_loop *)palloc0(sizeof(PLpgSQL_stmt_loop));
+                        newp->cmd_type = PLPGSQL_STMT_LOOP;
+                        newp->lineno   = plpgsql_location_to_lineno(@2);
+                        newp->label    = u_sess->plsql_cxt.curr_compile_context->ns_top->name;
+                        newp->body        = $3.stmts;
+                        newp->sqlString = plpgsql_get_curline_query();
+
+                        check_labels(u_sess->plsql_cxt.curr_compile_context->ns_top->name, $3.end_label, $3.end_label_location);
+                        plpgsql_ns_pop();
+
+                        $$ = (PLpgSQL_stmt *)newp;
+
+                        /* register the stmt if it is labeled */
+                        record_stmt_label(u_sess->plsql_cxt.curr_compile_context->ns_top->name, (PLpgSQL_stmt *)newp);
+                    }
                 ;
 
 stmt_while		: opt_block_label K_WHILE expr_until_loop loop_body
@@ -3530,6 +3558,30 @@ exit_type		: K_EXIT
                     }
                 | K_CONTINUE
                     {
+                        $$ = false;
+                    }
+                | K_LEAVE
+                    {
+                        /*
+                         * When the database is in mysql compatible mode
+                         * support "leave label"
+                         */
+                        if(u_sess->attr.attr_sql.sql_compatibility != B_FORMAT)
+                             ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+                                     errmsg("'LEAVE label' is only in database which dbcompatibility='B'.")));
+
+                        $$ = true;
+                    }
+                | K_ITERATE
+                    {
+                        /*
+                         * When the database is in mysql compatible mode
+                         * support "iterate label"
+                         */
+                        if(u_sess->attr.attr_sql.sql_compatibility != B_FORMAT)
+                             ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+                                     errmsg("'ITERATE label' is only in database which dbcompatibility='B'.")));
+
                         $$ = false;
                     }
                 ;
@@ -8473,7 +8525,7 @@ make_execsql_stmt(int firsttoken, int location)
     int					parenlevel = 0;
     List				*list_bracket = 0;		/* stack structure bracket tracker */
     List				*list_bracket_loc = 0;	/* location tracker */
-
+    bool                                label_loop = false;
     initStringInfo(&ds);
 
     /* special lookup mode for identifiers within the SQL text */
@@ -8586,6 +8638,55 @@ make_execsql_stmt(int firsttoken, int location)
             u_sess->plsql_cxt.curr_compile_context->plpgsql_IdentifierLookup = IDENTIFIER_LOOKUP_EXPR;
         }
 
+	/*
+	 * When the database is in mysql compatible mode, 
+	 * the loop syntax of mysql is compatible (label: loop)
+	 */
+        if (tok == ':' && prev_tok == T_WORD)
+        {
+            StringInfoData  lb;
+            initStringInfo(&lb);
+            int  lb_end = yylloc;
+            int  tok1 = yylex();
+            if(tok1 == K_LOOP)
+            {
+                if(u_sess->attr.attr_sql.sql_compatibility == B_FORMAT)
+                {
+                    int  count = 0;
+                    label_loop =  true;
+                    plpgsql_push_back_token(tok1);
+                    plpgsql_push_back_token(tok);
+                    plpgsql_append_source_text(&lb, location, lb_end);
+
+                    for(int i = lb.len-1; i > 0; i--)
+                    {
+                        if(lb.data[i] == ' ')
+                        {
+                            count++;
+                        }
+                        else
+                            break;
+                    }
+                    if(count > 0)
+                    {
+                        char*  name = (char*)palloc(lb.len-count+1);
+                        strncpy(name, lb.data, lb.len-count);
+                        name[lb.len-count] = '\0';
+                        plpgsql_ns_additem(PLPGSQL_NSTYPE_LABEL, 0, pg_strtolower(name));
+                        pfree(name);
+                    }
+                    else
+                        plpgsql_ns_additem(PLPGSQL_NSTYPE_LABEL, 0, pg_strtolower(lb.data));
+
+                    pfree_ext(lb.data);
+                    break;
+                }
+                else
+                    ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+                            errmsg("'label:' is only supported in database which dbcompatibility='B'.")));
+            }
+        }
+
         if (tok == T_CWORD && prev_tok!=K_SELECT 
                            && prev_tok!= K_PERFORM) {
             List  *dtname = yylval.cword.idents;
@@ -8870,6 +8971,9 @@ make_execsql_stmt(int firsttoken, int location)
                 }
             }
         }
+    } else if (label_loop)
+    {
+        appendStringInfoString(&ds, "\n");
     } else {
         plpgsql_append_source_text(&ds, location, yylloc);
 
diff --git a/src/common/pl/plpgsql/src/pl_scanner.cpp b/src/common/pl/plpgsql/src/pl_scanner.cpp
index 8e0da2bab..d9dd38394 100644
--- a/src/common/pl/plpgsql/src/pl_scanner.cpp
+++ b/src/common/pl/plpgsql/src/pl_scanner.cpp
@@ -142,8 +142,10 @@ static const ScanKeyword unreserved_keywords[] = {
     PG_KEYWORD("info", K_INFO, UNRESERVED_KEYWORD) 
     PG_KEYWORD("instantiation", K_INSTANTIATION, UNRESERVED_KEYWORD)
     PG_KEYWORD("intersect", K_INTERSECT, UNRESERVED_KEYWORD)
-    PG_KEYWORD("is", K_IS, UNRESERVED_KEYWORD) 
+    PG_KEYWORD("is", K_IS, UNRESERVED_KEYWORD)
+    PG_KEYWORD("iterate", K_ITERATE, UNRESERVED_KEYWORD)
     PG_KEYWORD("last", K_LAST, UNRESERVED_KEYWORD)
+    PG_KEYWORD("leave", K_LEAVE, UNRESERVED_KEYWORD)
     PG_KEYWORD("log", K_LOG, UNRESERVED_KEYWORD) 
     PG_KEYWORD("merge", K_MERGE, UNRESERVED_KEYWORD) 
     PG_KEYWORD("message", K_MESSAGE, UNRESERVED_KEYWORD) 
diff --git a/src/test/regress/expected/b_compatibility.out b/src/test/regress/expected/b_compatibility.out
index d206a918f..5268e18d1 100644
--- a/src/test/regress/expected/b_compatibility.out
+++ b/src/test/regress/expected/b_compatibility.out
@@ -916,6 +916,273 @@ SELECT * FROM view_schema.new_view3;
 
 RESET ROLE;
 \c regression
+-- test label:loop
+--error
+create or replace procedure doiterate(p1 int)
+as
+begin
+label1: loop
+p1 := p1+1;
+if p1 < 10 then
+iterate label1;
+end if;
+leave label1;
+end loop label1;
+raise notice 'p1:%',p1;
+end;
+/
+ERROR:  'label:' is only supported in database which dbcompatibility='B'.
+CONTEXT:  compilation of PL/pgSQL function "doiterate" near line 1
+--error
+create or replace procedure doiterate(p1 int)
+as
+begin
+<<label1>> loop
+p1 := p1+1;
+if p1 < 10 then
+iterate label1;
+end if;
+leave label1;
+end loop label1;
+raise notice 'p1:%',p1;
+end;
+/
+ERROR:  'ITERATE label' is only in database which dbcompatibility='B'.
+CONTEXT:  compilation of PL/pgSQL function "doiterate" near line 4
+--error
+create or replace procedure doiterate(p1 int)
+as
+begin
+<<label1>> loop
+p1 := p1+1;
+if p1 < 10 then
+continue label1;
+end if;
+leave label1;
+end loop label1;
+raise notice 'p1:%',p1;
+end;
+/
+ERROR:  'LEAVE label' is only in database which dbcompatibility='B'.
+CONTEXT:  compilation of PL/pgSQL function "doiterate" near line 5
+--success
+create or replace procedure doiterate(p1 int)
+as
+begin
+<<label1>> loop
+p1 := p1+1;
+if p1 < 10 then
+continue label1;
+end if;
+exit label1;
+end loop label1;
+raise notice 'p1:%',p1;
+end;
+/
+call doiterate(3);
+NOTICE:  p1:10
+ doiterate 
+-----------
+ 
+(1 row)
+
+drop procedure if exists doiterate;
+\c b
+--success
+create or replace procedure doiterate(p1 int)
+as
+begin
+label1   :
+loop
+p1 := p1+1;
+if p1 < 10 then
+raise notice '123';
+end if;
+exit;
+end loop label1;
+end;
+/
+call doiterate(2);
+NOTICE:  123
+ doiterate 
+-----------
+ 
+(1 row)
+
+--success
+create or replace procedure doiterate(p1 int)
+as
+begin
+LABEL1:
+loop
+p1 := p1+1;
+if p1 < 10 then
+raise notice '123';
+end if;
+exit LABEL1;
+end loop LABEL1;
+end;
+/
+call doiterate(2);
+NOTICE:  123
+ doiterate 
+-----------
+ 
+(1 row)
+
+--success
+create or replace procedure doiterate(p1 int)
+as
+begin
+LAbEL1:
+loop
+p1 := p1+1;
+if p1 < 10 then
+raise notice '123';
+end if;
+exit LABeL1;
+end loop LaBEL1;
+end;
+/
+call doiterate(2);
+NOTICE:  123
+ doiterate 
+-----------
+ 
+(1 row)
+
+--success
+create or replace procedure doiterate(p1 int)
+as
+begin
+label1: loop
+p1 := p1+1;
+if p1 < 10 then
+iterate label1;
+end if;
+leave label1;
+end loop label1;
+raise notice 'p1:%',p1;
+end;
+/
+call doiterate(3);
+NOTICE:  p1:10
+ doiterate 
+-----------
+ 
+(1 row)
+
+create or replace procedure doiterate(p1 int)
+as
+begin
+loop
+p1 := p1+1;
+if p1 < 10 then
+iterate;
+end if;
+leave;
+end loop;
+raise notice 'p1:%',p1;
+end;
+/
+call doiterate(3);
+NOTICE:  p1:10
+ doiterate 
+-----------
+ 
+(1 row)
+
+create or replace function labeltest(n int) return int
+as
+p int;
+i int;
+begin
+p :=2;
+label1:  loop
+if p < n then
+p := p+1;
+iterate label1;
+end if;
+leave label1;
+end loop label1;
+return p;
+end;
+/
+call labeltest(5);
+ labeltest 
+-----------
+         5
+(1 row)
+
+create or replace function labeltest(n int) return int
+as
+p int;
+i int;
+begin
+p :=2;
+LABEL1:  loop
+if p < n then
+p := p+1;
+iterate LABEL1;
+end if;
+leave LABEL1;
+end loop LABEL1;
+return p;
+end;
+/
+call labeltest(3);
+ labeltest 
+-----------
+         3
+(1 row)
+
+create or replace function labeltest(n int) return int
+as
+p int;
+i int;
+begin
+p :=2;
+lAbel1:  loop
+if p < n then
+p := p+1;
+iterate labEl1;
+end if;
+leave LAbel1;
+end loop labEL1;
+return p;
+end;
+/
+call labeltest(7);
+ labeltest 
+-----------
+         7
+(1 row)
+
+create or replace function labeltest(n int) return int
+as
+p int;
+i int;
+begin
+p :=2;
+loop
+if p < n then
+p := p+1;
+iterate;
+end if;
+leave;
+end loop;
+return p;
+end;
+/
+call labeltest(9);
+ labeltest 
+-----------
+         9
+(1 row)
+
+drop procedure if exists doiterate;
+drop function if exists labeltest;
+\c regression
 drop database b;
 DROP USER test_c;
 DROP USER test_d;
diff --git a/src/test/regress/sql/b_compatibility.sql b/src/test/regress/sql/b_compatibility.sql
index 38ca01953..ec3c45346 100644
--- a/src/test/regress/sql/b_compatibility.sql
+++ b/src/test/regress/sql/b_compatibility.sql
@@ -289,6 +289,235 @@ RESET ROLE;
 
 \c regression
 
+-- test label:loop
+--error
+create or replace procedure doiterate(p1 int)
+as
+begin
+label1: loop
+p1 := p1+1;
+if p1 < 10 then
+iterate label1;
+end if;
+leave label1;
+end loop label1;
+raise notice 'p1:%',p1;
+end;
+/
+
+--error
+create or replace procedure doiterate(p1 int)
+as
+begin
+<<label1>> loop
+p1 := p1+1;
+if p1 < 10 then
+iterate label1;
+end if;
+leave label1;
+end loop label1;
+raise notice 'p1:%',p1;
+end;
+/
+
+--error
+create or replace procedure doiterate(p1 int)
+as
+begin
+<<label1>> loop
+p1 := p1+1;
+if p1 < 10 then
+continue label1;
+end if;
+leave label1;
+end loop label1;
+raise notice 'p1:%',p1;
+end;
+/
+
+--success
+create or replace procedure doiterate(p1 int)
+as
+begin
+<<label1>> loop
+p1 := p1+1;
+if p1 < 10 then
+continue label1;
+end if;
+exit label1;
+end loop label1;
+raise notice 'p1:%',p1;
+end;
+/
+
+call doiterate(3);
+
+drop procedure if exists doiterate;
+\c b
+--success
+create or replace procedure doiterate(p1 int)
+as
+begin
+label1   :
+loop
+p1 := p1+1;
+if p1 < 10 then
+raise notice '123';
+end if;
+exit;
+end loop label1;
+end;
+/
+
+call doiterate(2);
+
+--success
+create or replace procedure doiterate(p1 int)
+as
+begin
+LABEL1:
+loop
+p1 := p1+1;
+if p1 < 10 then
+raise notice '123';
+end if;
+exit LABEL1;
+end loop LABEL1;
+end;
+/
+
+call doiterate(2);
+
+--success
+create or replace procedure doiterate(p1 int)
+as
+begin
+LAbEL1:
+loop
+p1 := p1+1;
+if p1 < 10 then
+raise notice '123';
+end if;
+exit LABeL1;
+end loop LaBEL1;
+end;
+/
+
+call doiterate(2);
+
+--success
+create or replace procedure doiterate(p1 int)
+as
+begin
+label1: loop
+p1 := p1+1;
+if p1 < 10 then
+iterate label1;
+end if;
+leave label1;
+end loop label1;
+raise notice 'p1:%',p1;
+end;
+/
+
+call doiterate(3);
+
+create or replace procedure doiterate(p1 int)
+as
+begin
+loop
+p1 := p1+1;
+if p1 < 10 then
+iterate;
+end if;
+leave;
+end loop;
+raise notice 'p1:%',p1;
+end;
+/
+
+call doiterate(3);
+
+create or replace function labeltest(n int) return int
+as
+p int;
+i int;
+begin
+p :=2;
+label1:  loop
+if p < n then
+p := p+1;
+iterate label1;
+end if;
+leave label1;
+end loop label1;
+return p;
+end;
+/
+
+call labeltest(5);
+
+create or replace function labeltest(n int) return int
+as
+p int;
+i int;
+begin
+p :=2;
+LABEL1:  loop
+if p < n then
+p := p+1;
+iterate LABEL1;
+end if;
+leave LABEL1;
+end loop LABEL1;
+return p;
+end;
+/
+
+call labeltest(3);
+
+create or replace function labeltest(n int) return int
+as
+p int;
+i int;
+begin
+p :=2;
+lAbel1:  loop
+if p < n then
+p := p+1;
+iterate labEl1;
+end if;
+leave LAbel1;
+end loop labEL1;
+return p;
+end;
+/
+
+call labeltest(7);
+
+create or replace function labeltest(n int) return int
+as
+p int;
+i int;
+begin
+p :=2;
+loop
+if p < n then
+p := p+1;
+iterate;
+end if;
+leave;
+end loop;
+return p;
+end;
+/
+
+call labeltest(9);
+drop procedure if exists doiterate;
+drop function if exists labeltest;
+
+\c regression
+
 drop database b;
 DROP USER test_c;
 DROP USER test_d;