diff --git a/library/think/Collection.php b/library/think/Collection.php
index b450c48c..20bbe6a2 100644
--- a/library/think/Collection.php
+++ b/library/think/Collection.php
@@ -24,6 +24,8 @@ class Collection implements ArrayAccess, Countable, IteratorAggregate, JsonSeria
     protected $visible = [];
     // 隐藏属性
     protected $hidden = [];
+    // 追加属性
+    protected $append = [];
 
     public function __construct($items = [])
     {
@@ -69,6 +71,19 @@ class Collection implements ArrayAccess, Countable, IteratorAggregate, JsonSeria
         return $this;
     }
 
+    /**
+     * 设置需要追加的输出属性
+     * @access public
+     * @param array $append 属性列表
+     * @param bool  $override  是否覆盖
+     * @return $this
+     */
+    public function append($append = [], $override = false)
+    {
+        $this->append = [$append, $override];
+        return $this;
+    }
+
     public function toArray()
     {
         $result = [];
@@ -79,6 +94,9 @@ class Collection implements ArrayAccess, Countable, IteratorAggregate, JsonSeria
                 } elseif (!empty($this->hidden)) {
                     $item->hidden($this->hidden[0], $this->hidden[1]);
                 }
+                if (!empty($this->append)) {
+                    $item->append($this->append[0], $this->append[1]);
+                }
                 $result[$key] = $item->toArray();
             } else {
                 $result[$key] = $item;
diff --git a/library/think/Model.php b/library/think/Model.php
index 772e6f12..3945269f 100644
--- a/library/think/Model.php
+++ b/library/think/Model.php
@@ -596,12 +596,11 @@ abstract class Model implements \JsonSerializable, \ArrayAccess
      */
     public function toArray()
     {
-        $item    = [];
-        $visible = [];
-        $hidden  = [];
+        $item = [];
         // 过滤属性
         if (!empty($this->visible)) {
-            $array = [];
+            $visible = [];
+            $array   = [];
             foreach ($this->visible as $key => $val) {
                 if (is_array($val)) {
                     $array[]       = $key;
@@ -612,7 +611,8 @@ abstract class Model implements \JsonSerializable, \ArrayAccess
             }
             $data = array_intersect_key($this->data, array_flip($array));
         } elseif (!empty($this->hidden)) {
-            $array = [];
+            $hidden = [];
+            $array  = [];
             foreach ($this->hidden as $key => $val) {
                 if (is_array($val)) {
                     $hidden[$key] = $val;
@@ -653,8 +653,14 @@ abstract class Model implements \JsonSerializable, \ArrayAccess
         }
         // 追加属性（必须定义获取器）
         if (!empty($this->append)) {
-            foreach ($this->append as $name) {
-                $item[$name] = $this->getAttr($name);
+            foreach ($this->append as $key => $name) {
+                if (is_array($name)) {
+                    // 追加关联对象属性
+                    $relation   = $this->getAttr($key);
+                    $item[$key] = $relation->append($name)->toArray();
+                } else {
+                    $item[$name] = $this->getAttr($name);
+                }
             }
         }
         return !empty($item) ? $item : [];