diff --git a/src/model/concern/Attribute.php b/src/model/concern/Attribute.php
index 9cd0abbc..fbd93734 100644
--- a/src/model/concern/Attribute.php
+++ b/src/model/concern/Attribute.php
@@ -15,7 +15,6 @@
 
 use BackedEnum;
 use Closure;
-use InvalidArgumentException;
 use Stringable;
 use think\db\Express;
 use think\db\Raw;
diff --git a/src/model/concern/Conversion.php b/src/model/concern/Conversion.php
index 4b8fe0ee..4d5fa4f0 100644
--- a/src/model/concern/Conversion.php
+++ b/src/model/concern/Conversion.php
@@ -108,8 +108,8 @@ public function toArray(): array
             if ($val instanceof Modelable || $val instanceof Collection) {
                 if (!empty($relation[$name])) {
                     // 处理关联数据输出
-                    foreach ($relation[$name] as $key => $val) {
-                        $val->$key($val);
+                    foreach ($relation[$name] as $key => $attr) {
+                        $val->$key($attr);
                     }
                 }
                 $item[$name] = $val->toarray();
@@ -126,8 +126,16 @@ public function toArray(): array
         }
 
         // 输出额外属性 必须定义获取器
-        foreach ($this->getOption('append') as $key) {
-            $item[$key] = $this->get($key);
+        foreach ($this->getOption('append') as $key => $field) {
+            if (is_numeric($key)) {
+                $item[$field] = $this->get($field);
+            } else {
+                // 追加关联属性
+                $relation = $this->getRelationData($key, false);
+                foreach((array) $field as $name) {
+                    $item[$name] = $relation[$name];
+                }
+            } 
         }
 
         return $item;
diff --git a/src/model/concern/RelationShip.php b/src/model/concern/RelationShip.php
index bc1acd1f..c9f324d4 100644
--- a/src/model/concern/RelationShip.php
+++ b/src/model/concern/RelationShip.php
@@ -160,17 +160,20 @@ private function relationDelete(array $relations = [])
      * 获取关联数据
      *
      * @param string $name 名称
+     * @param bool   $set  是否设置为当前模型属性
      *
      * @return mixed
      */
-    protected function getRelationData(string $name)
+    protected function getRelationData(string $name, bool $set = true)
     {
         $method = Str::camel($name);
         if (method_exists($this, $method)) {
             $modelRelation = $this->$method();
             if ($modelRelation instanceof Relation) {
                 $value = $modelRelation->getRelation();
-                $this->setData($name, $value);
+                if ($set) {
+                    $this->setData($name, $value);
+                }
                 return $value;
             }
         }