diff --git a/lang/zh-cn.php b/lang/zh-cn.php
index c821f9fe..eb7a9142 100644
--- a/lang/zh-cn.php
+++ b/lang/zh-cn.php
@@ -48,6 +48,7 @@ return [
     'KVDB init error'                                           => '没有初始化KVDB，请在SAE管理平台初始化KVDB服务',
     'fields not exists'                                         => '数据表字段不存在',
     'where express error'                                       => '查询表达式错误',
+    'not support data'                                          => '不支持的数据表达式',
     'no data to update'                                         => '没有任何数据需要更新',
     'miss data to insert'                                       => '缺少需要写入的数据',
     'miss complex primary data'                                 => '缺少复合主键数据',
diff --git a/library/think/db/Builder.php b/library/think/db/Builder.php
index d4d27a1e..fa66e06e 100644
--- a/library/think/db/Builder.php
+++ b/library/think/db/Builder.php
@@ -120,6 +120,8 @@ abstract class Builder
                     case 'dec':
                         $result[$item] = $item . '-' . floatval($val[1]);
                         break;
+                    default:
+                        throw new Exception('not support data :[' . $val[0] . ']');
                 }
             } elseif (is_scalar($val)) {
                 // 过滤非标量数据