diff --git a/CHANGELOG.md b/CHANGELOG.md
index da3f9fdc4..a3e0433d1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,10 @@
 
 - [#1303](https://github.com/hyperf/hyperf/pull/1303) Deleted useless `$httpMethod` for `Hyperf\RpcServer\Router\Router`.
 
+## Fixed
+
+- [#1330](https://github.com/hyperf/hyperf/pull/1330) Fixed bug when using `(new Parallel())->add($callback, $key)` and the parameter `$key` is a not string index, the returned result will sort `$key` from 0.
+
 # v1.1.17 - 2020-01-24
 
 ## Added
diff --git a/src/utils/src/Parallel.php b/src/utils/src/Parallel.php
index 3f7193c61..589e28557 100644
--- a/src/utils/src/Parallel.php
+++ b/src/utils/src/Parallel.php
@@ -39,10 +39,10 @@ class Parallel
 
     public function add(callable $callable, $key = null)
     {
-        if (is_string($key)) {
-            $this->callbacks[$key] = $callable;
-        } else {
+        if (is_null($key)) {
             $this->callbacks[] = $callable;
+        } else {
+            $this->callbacks[$key] = $callable;
         }
     }
 
diff --git a/src/utils/tests/ParallelTest.php b/src/utils/tests/ParallelTest.php
index 06632c9dc..a1e1b66fc 100644
--- a/src/utils/tests/ParallelTest.php
+++ b/src/utils/tests/ParallelTest.php
@@ -117,6 +117,39 @@ class ParallelTest extends TestCase
         $this->assertEquals(count($res), 4);
     }
 
+    public function testParallelKeys()
+    {
+        $parallel = new Parallel();
+        $callback = function () {
+            return 1;
+        };
+        for ($i = 0; $i < 4; ++$i) {
+            $parallel->add($callback);
+        }
+        $res = $parallel->wait();
+        $parallel->clear();
+        $this->assertSame([1, 1, 1, 1], $res);
+
+        for ($i = 0; $i < 4; ++$i) {
+            $parallel->add($callback, 'id_' . $i);
+        }
+        $res = $parallel->wait();
+        $parallel->clear();
+        $this->assertSame(['id_0' => 1, 'id_1' => 1, 'id_2' => 1, 'id_3' => 1], $res);
+
+        for ($i = 0; $i < 4; ++$i) {
+            $parallel->add($callback, $i - 1);
+        }
+        $res = $parallel->wait();
+        $parallel->clear();
+        $this->assertSame([-1 => 1, 0 => 1, 1 => 1, 2 => 1], $res);
+
+        $parallel->add($callback, 1.0);
+        $res = $parallel->wait();
+        $parallel->clear();
+        $this->assertSame([1.0 => 1], $res);
+    }
+
     public function testParallelThrows()
     {
         $parallel = new Parallel();