diff --git a/inc/Maat_rule.h b/inc/Maat_rule.h
index f7399c1..a9fed65 100644
--- a/inc/Maat_rule.h
+++ b/inc/Maat_rule.h
@@ -161,7 +161,7 @@ int Maat_table_callback_register(Maat_feather_t feather,short table_id,
 
 enum MAAT_SCAN_OPT
 {
-	MAAT_SET_SCAN_DISTRICT=1		//VALUE is a const char*,MUST end with '\0',SIZE= strlen(string+'\0')+1.DEFAULT: no default.
+	MAAT_SET_SCAN_DISTRICT=1		//VALUE is a const char*,SIZE= strlen(string).DEFAULT: no default.
 };
 //return 0 if success, return -1 when failed;
 int Maat_set_scan_status(Maat_feather_t feather,scan_status_t* mid,enum MAAT_SCAN_OPT type,const void* value,int size);
diff --git a/src/entry/Maat_api.cpp b/src/entry/Maat_api.cpp
index 44da318..c522b29 100644
--- a/src/entry/Maat_api.cpp
+++ b/src/entry/Maat_api.cpp
@@ -1491,7 +1491,7 @@ int Maat_set_scan_status(Maat_feather_t feather,scan_status_t* mid,enum MAAT_SCA
 			{
 				return -1;
 			}
-			map_ret=map_str2int(_feather->scanner->district_map,(const char*)value,&(_mid->district_id));
+			map_ret=map_unNullstr2int(_feather->scanner->district_map,(const char*)value,size,&(_mid->district_id));
 			if(map_ret<0)
 			{
 				//May be the district is not effected yet.
diff --git a/src/entry/Maat_rule.cpp b/src/entry/Maat_rule.cpp
index f460534..789e97c 100644
--- a/src/entry/Maat_rule.cpp
+++ b/src/entry/Maat_rule.cpp
@@ -26,7 +26,7 @@
 #include "mesa_fuzzy.h"
 #include "great_index_engine.h"
 
-int MAAT_FRAME_VERSION_1_8_20160909_TABLE_CONJ=1;
+int MAAT_FRAME_VERSION_1_8_20160918_TABLE_CONJ=1;
 const char *maat_module="MAAT Frame";
 
 const char* CHARSET_STRING[]={"NONE","gbk","big5","unicode","utf8","bin",
diff --git a/src/entry/map_str2int.cpp b/src/entry/map_str2int.cpp
index f8cf554..0d1ce51 100644
--- a/src/entry/map_str2int.cpp
+++ b/src/entry/map_str2int.cpp
@@ -75,6 +75,24 @@ int map_str2int(MESA_htable_handle handle,const char* string,int* value)
 		return -1;
 	}	
 }
+int map_unNullstr2int(MESA_htable_handle handle,const char* string,int len,int* value)
+{
+	int *data=NULL;
+	long cb_ret=0;
+	
+	data=(int*)MESA_htable_search_cb(handle,(unsigned char*)string,len,
+									read_map_val,value,&cb_ret);
+									
+//	data=(int*)MESA_htable_search(handle,(unsigned char*)string,len);
+	if(cb_ret>0)
+	{
+		return 1;
+	}
+	else
+	{
+		return -1;
+	}	
+}
 void duplicate_func(const uchar * key, uint size, void * data, void * user)
 {
 	MESA_htable_handle target=(MESA_htable_handle)user;
diff --git a/src/entry/map_str2int.h b/src/entry/map_str2int.h
index 132a1e0..54e93cd 100644
--- a/src/entry/map_str2int.h
+++ b/src/entry/map_str2int.h
@@ -4,6 +4,7 @@ MESA_htable_handle map_create(void);
 void map_destroy(MESA_htable_handle p);
 int map_register(MESA_htable_handle handle,const char* string,int value);
 int map_str2int(MESA_htable_handle handle,const char* string,int* value);
+int map_unNullstr2int(MESA_htable_handle handle,const char* string,int size,int* value);
 MESA_htable_handle map_duplicate(MESA_htable_handle origin_map);
 #endif
 
diff --git a/test/maat_test.cpp b/test/maat_test.cpp
index bb3ecc9..96ae1f7 100644
--- a/test/maat_test.cpp
+++ b/test/maat_test.cpp
@@ -415,7 +415,7 @@ int test_expr_plus(Maat_feather_t feather,const char* table_name,scan_status_t*
 		printf("Should not hit without setting district.\n");
 		return -1;
 	}
-	ret=Maat_set_scan_status(feather, mid, MAAT_SET_SCAN_DISTRICT,region_name,strlen(region_name)+1);
+	ret=Maat_set_scan_status(feather, mid, MAAT_SET_SCAN_DISTRICT,region_name,strlen(region_name));
 	if(ret<0)
 	{
 		printf("set MAAT_SET_SCAN_DISTRICT failed.\n");