diff --git a/src/accountMgr/c_program/cdrCollector/cdrdb.c b/src/accountMgr/c_program/cdrCollector/cdrdb.c
index e145efb..343b421 100644
--- a/src/accountMgr/c_program/cdrCollector/cdrdb.c
+++ b/src/accountMgr/c_program/cdrCollector/cdrdb.c
@@ -1265,7 +1265,14 @@ void clear_table(char *table_name)
 		cdr_log("[ERR %d][clear_table]:Can not connect to CDR_DB",mysql_errno(pubConn));
 		return;
 	}
+
+	if (strstr(table_name, "cdrFromSGSN") != NULL) {
+	sprintf(mng_sqlstr,"delete from CDR_DB.%s WHERE TO_DAYS(changeTime)<TO_DAYS(NOW());",table_name);
+
+	}else{
 	sprintf(mng_sqlstr,"delete from CDR_DB.%s WHERE TO_DAYS(releaseTime)<TO_DAYS(NOW());",table_name);
+	}
+	
 	if(mysql_getnores(pubConn,mng_sqlstr) != 0)
 		cdr_log("[ERR %d][clear_table]:%s",mysql_errno(pubConn),mng_sqlstr);
 	else