diff --git a/library/think/db/Query.php b/library/think/db/Query.php
index 42b1c120..75086bc6 100644
--- a/library/think/db/Query.php
+++ b/library/think/db/Query.php
@@ -569,7 +569,7 @@ class Query
             list($distinct, $field) = explode(' ', $field);
         }
 
-        if (!preg_match('/^[\w\.\*]+$/', $field)) {
+        if (!preg_match('/^[\w\.\+\-\*]+$/', $field)) {
             throw new Exception('not support data:' . $field);
         }