diff --git a/inc/Maat_command.h b/inc/Maat_command.h
index 0a65beb..ed06262 100644
--- a/inc/Maat_command.h
+++ b/inc/Maat_command.h
@@ -125,6 +125,7 @@ struct Maat_line_t
 	int expire_after;	//expired after $timeout$ seconds, set to 0 for never timeout.
 };
 struct Maat_cmd_t* Maat_create_cmd(const struct Maat_rule_t* rule, int group_num);
+int Maat_cmd_set_opt(struct Maat_cmd_t* cmd, enum MAAT_RULE_OPT type, const char* val, int size);
 //input: which_group 0~group_num
 //input: region can be freed after added.
 void Maat_add_region2cmd(struct Maat_cmd_t* cmd,int which_group,const struct Maat_region_t* region);
diff --git a/inc/Maat_rule.h b/inc/Maat_rule.h
index 6a83d32..ba9a209 100644
--- a/inc/Maat_rule.h
+++ b/inc/Maat_rule.h
@@ -6,7 +6,7 @@
 *	to reside in the heart) of the departed would reach the paradise of afterlife
 *	successfully.
 *	Author: zhengchao@iie.ac.cn,MESA
-*	Version 2015-11-09 digest scan
+*	Version 2018-07-27 huge service_define
 *	NOTE: MUST compile with G++
 *	All right reserved by Institute of Infomation Engineering,Chinese Academic of Science 2014~2018
 *********************************************************
@@ -48,7 +48,8 @@ typedef	void*	stream_para_t;
 typedef	void*	Maat_feather_t;
 
 
-#define	MAX_SERVICE_DEFINE_LEN	128
+#define	MAX_SERVICE_DEFINE_LEN			128
+#define	MAX_HUGE_SERVICE_DEFINE_LEN		(1024*4)
 struct Maat_rule_t
 {
 	int		config_id;
diff --git a/src/entry/Maat_command.cpp b/src/entry/Maat_command.cpp
index c6ca3c3..a3d81b0 100644
--- a/src/entry/Maat_command.cpp
+++ b/src/entry/Maat_command.cpp
@@ -28,6 +28,7 @@ struct _Maat_cmd_inner_t
 	enum MAAT_OPERATION op;
 	int ref_cnt;
 	int region_size[MAX_EXPR_ITEM_NUM];
+	char* huge_service_defined;		//max to 4KB
 	struct _Maat_cmd_inner_t* next;
 };
 int _wrap_redisGetReply(redisContext *c, redisReply **reply)
@@ -854,7 +855,7 @@ int build_serial_rule(_Maat_feather_t *feather,struct _Maat_cmd_inner_t* _cmd,st
 				,p_m_rule->action
 				,p_m_rule->do_blacklist
 				,p_m_rule->do_log
-				,p_m_rule->service_defined
+				,(_cmd->huge_service_defined!=NULL)?(_cmd->huge_service_defined):(p_m_rule->service_defined)
 				,cmd->group_num);
 		set_serial_rule(list+rule_num,MAAT_OP_ADD,cmd->compile.config_id,cmd->label_id,feather->compile_tn,line,timeout);
 
@@ -1444,6 +1445,34 @@ struct Maat_cmd_t* Maat_create_cmd(const struct Maat_rule_t* rule, int group_num
 	}
 	return (struct Maat_cmd_t*)_cmd;
 }
+int Maat_cmd_set_opt(struct Maat_cmd_t* cmd, enum MAAT_RULE_OPT type, const char* val, int size)
+{
+	struct _Maat_cmd_inner_t* _cmd=(struct _Maat_cmd_inner_t* )cmd;
+	int ret=-1;
+	switch(type)
+	{
+		case	MAAT_RULE_SERV_DEFINE:
+			if(size>MAX_HUGE_SERVICE_DEFINE_LEN)
+			{
+				ret=-1;
+			}
+			else
+			{
+				if(_cmd->huge_service_defined!=NULL)
+				{
+					free(_cmd->huge_service_defined);
+				}
+				_cmd->huge_service_defined=(char*)calloc(sizeof(char),size+1);
+				memcpy(_cmd->huge_service_defined,val, size);
+				ret=0;
+			}
+			break;
+		default:
+			break;
+	}
+	return ret;
+}
+
 int Maat_cmd_set_group(Maat_feather_t feather,int group_id, const struct Maat_region_t* region, enum MAAT_OPERATION op)
 {
 	_Maat_feather_t* _feather=(_Maat_feather_t*)feather;
@@ -1592,6 +1621,12 @@ void Maat_free_cmd(struct Maat_cmd_t* cmd)
 	}
 	free(cmd->groups);
 	cmd->groups=NULL;
+	if(_cmd->huge_service_defined!=NULL)
+	{
+		free(_cmd->huge_service_defined);
+		_cmd->huge_service_defined=NULL;
+	}
+
 	_cmd->next=NULL;
 	free(_cmd);
 	return;
diff --git a/src/entry/Maat_rule.cpp b/src/entry/Maat_rule.cpp
index aedc44a..a74a717 100644
--- a/src/entry/Maat_rule.cpp
+++ b/src/entry/Maat_rule.cpp
@@ -30,7 +30,7 @@
 #include "stream_fuzzy_hash.h"
 #include "gram_index_engine.h"
 
-int MAAT_FRAME_VERSION_2_2_20180719=1;
+int MAAT_FRAME_VERSION_2_2_20180727=1;
 
 const char* CHARSET_STRING[]={"NONE","gbk","big5","unicode","utf8","bin",
 							"unicode_ascii_esc","unicode_ascii_aligned","unicode_ncr_dec","unicode_ncr_hex","url_encode_gb2312","url_encode_utf8",""};
diff --git a/test/maat_test.cpp b/test/maat_test.cpp
index e5741b8..059451b 100644
--- a/test/maat_test.cpp
+++ b/test/maat_test.cpp
@@ -636,7 +636,8 @@ int test_add_expr_command(Maat_feather_t feather,const char* region_table,int co
 {
 	struct Maat_cmd_t* cmd=NULL;
 	struct Maat_rule_t rule;
-
+	char huge_serv_def[1024*2];
+	memset(huge_serv_def,'s',sizeof(huge_serv_def));
 	struct Maat_region_t region;
 	int group_num=1,ret=0;
 	memset(&rule,0,sizeof(rule));
@@ -655,6 +656,7 @@ int test_add_expr_command(Maat_feather_t feather,const char* region_table,int co
 	region.expr_rule.expr_type=EXPR_TYPE_AND;
 	region.expr_rule.match_method=MATCH_METHOD_SUB;
 	region.expr_rule.hex_bin=UNCASE_PLAIN;
+	Maat_cmd_set_opt(cmd, MAAT_RULE_SERV_DEFINE, huge_serv_def, sizeof(huge_serv_def));
 	Maat_add_region2cmd(cmd, 0, &region);
 	//use pipeline model.
 	ret=Maat_cmd_append(feather, cmd, MAAT_OP_ADD);