diff --git a/library/think/Validate.php b/library/think/Validate.php
index 32196a46..608e1e4a 100644
--- a/library/think/Validate.php
+++ b/library/think/Validate.php
@@ -880,7 +880,7 @@ class Validate
             // 支持多个字段验证
             $fields = explode('^', $key);
             foreach ($fields as $key) {
-                if (isset($data[$field])) {
+                if (isset($data[$key])) {
                     $map[$key] = $data[$key];
                 }
             }