diff --git a/library/think/model/Relation.php b/library/think/model/Relation.php
index 0d3f5aaf..f6cbecca 100644
--- a/library/think/model/Relation.php
+++ b/library/think/model/Relation.php
@@ -69,6 +69,7 @@ class Relation
             'foreignKey' => $this->foreignKey,
             'localKey'   => $this->localKey,
             'alias'      => $this->alias,
+            'joinType'   => $this->joinType,
         ];
         return $name ? $info[$name] : $info;
     }