diff --git a/application/third_party/ctmobilefirst/models/api_model.php b/application/third_party/ctmobilefirst/models/api_model.php
index 4b312680..768c2d45 100644
--- a/application/third_party/ctmobilefirst/models/api_model.php
+++ b/application/third_party/ctmobilefirst/models/api_model.php
@@ -632,6 +632,7 @@ class Api_model extends CI_Model {
         
         // 合并为逗号分隔的字符串，所有类型的字符串
         $result_string = implode(',', $unique_values);
+        $result_string = trim($result_string, ',');  // 去掉首尾的逗号
         
         //return $result_string;
         $sql2 = "  select SYC_SN, SYC2_CodeDiscribe
@@ -816,7 +817,9 @@ class Api_model extends CI_Model {
 
         // 合并为逗号分隔的字符串，所有类型的字符串
         $type_string = implode(',', $unique_values);
-        $extendType_string = implode(',', $unique_values2);        
+        $type_string = trim($type_string, ',');  // 去掉首尾的逗号
+        $extendType_string = implode(',', $unique_values2);   
+        $extendType_string = trim($extendType_string, ',');  // 去掉首尾的逗号     
         
         $resultClass = new stdClass();