diff --git a/library/think/model/concern/Conversion.php b/library/think/model/concern/Conversion.php
index b6c7cd647a..697e495bf3 100644
--- a/library/think/model/concern/Conversion.php
+++ b/library/think/model/concern/Conversion.php
@@ -223,13 +223,15 @@ public function jsonSerialize()
      * 转换数据集为数据集对象
      * @access public
      * @param  array|Collection $collection 数据集
+     * @param  string           $resultSetType 数据集类
      * @return Collection
      */
-    public function toCollection($collection)
+    public function toCollection($collection, $resultSetType = null)
     {
-        if ($this->resultSetType && false !== strpos($this->resultSetType, '\\')) {
-            $class      = $this->resultSetType;
-            $collection = new $class($collection);
+        $resultSetType = $resultSetType ?: $this->resultSetType;
+
+        if ($resultSetType && false !== strpos($resultSetType, '\\')) {
+            $collection = new $resultSetType($collection);
         } else {
             $collection = new ModelCollection($collection);
         }