diff --git a/library/think/Model.php b/library/think/Model.php
index 47fdc502..40b8dfe1 100644
--- a/library/think/Model.php
+++ b/library/think/Model.php
@@ -1747,9 +1747,11 @@ abstract class Model implements \JsonSerializable, \ArrayAccess
      */
     public function morphTo($morph = null, $alias = [])
     {
+        $trace    = debug_backtrace(false, 2);
+        $relation = Loader::parseName($trace[1]['function']);
+
         if (is_null($morph)) {
-            $trace = debug_backtrace(false, 2);
-            $morph = Loader::parseName($trace[1]['function']);
+            $morph = $relation;
         }
         // 记录当前关联信息
         if (is_array($morph)) {
@@ -1758,7 +1760,7 @@ abstract class Model implements \JsonSerializable, \ArrayAccess
             $morphType  = $morph . '_type';
             $foreignKey = $morph . '_id';
         }
-        return new MorphTo($this, $morphType, $foreignKey, $alias);
+        return new MorphTo($this, $morphType, $foreignKey, $alias, $relation);
     }
 
     public function __call($method, $args)
diff --git a/library/think/model/relation/MorphTo.php b/library/think/model/relation/MorphTo.php
index d406e8f8..c660a757 100644
--- a/library/think/model/relation/MorphTo.php
+++ b/library/think/model/relation/MorphTo.php
@@ -23,6 +23,7 @@ class MorphTo extends Relation
     protected $morphType;
     // 多态别名
     protected $alias;
+    protected $relation;
 
     /**
      * 构造函数
@@ -31,13 +32,15 @@ class MorphTo extends Relation
      * @param string $morphType 多态字段名
      * @param string $morphKey  外键名
      * @param array  $alias     多态别名定义
+     * @param string $relation  关联名
      */
-    public function __construct(Model $parent, $morphType, $morphKey, $alias = [])
+    public function __construct(Model $parent, $morphType, $morphKey, $alias = [], $relation)
     {
         $this->parent    = $parent;
         $this->morphType = $morphType;
         $this->morphKey  = $morphKey;
         $this->alias     = $alias;
+        $this->relation  = $relation;
     }
 
     /**
@@ -237,13 +240,13 @@ class MorphTo extends Relation
         $this->parent->setAttr($morphKey, $model->$pk);
         $this->parent->setAttr($morphType, get_class($model));
         $this->parent->save();
-        return $this;
+
+        return $this->parent->setAttr($this->relation, $model);
     }
 
     /**
-     * 添加关联数据
+     * 注销关联数据
      * @access public
-     * @param Model $model       关联模型对象
      * @return Model
      */
     public function dissociate()
@@ -254,7 +257,8 @@ class MorphTo extends Relation
         $this->parent->setAttr($morphKey, null);
         $this->parent->setAttr($morphType, null);
         $this->parent->save();
-        return $this;
+
+        return $this->parent->setAttr($this->relation, null);
     }
 
     /**