diff --git a/CHANGELOG.md b/CHANGELOG.md
index e1948c56..4deecdb3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,8 @@
 # Changelog
 
+## Next Version
+* 对象存储，修复无法对 key 为空字符串的对象进行操作
+
 ## 7.8.0 (2022-10-25)
 * 移除不推荐域名，并增加区域亚太-首尔和华东-浙江2
 * 对象存储，修复断点上传的文件内容不正确
diff --git a/src/Qiniu/functions.php b/src/Qiniu/functions.php
index 3c03455e..9a768e6f 100644
--- a/src/Qiniu/functions.php
+++ b/src/Qiniu/functions.php
@@ -129,12 +129,12 @@ function json_decode($json, $assoc = false, $depth = 512)
      * @param string $key 待操作的文件名
      *
      * @return string  符合七牛API规格的数据格式
-     * @link http://developer.qiniu.com/docs/v6/api/reference/data-formats.html
+     * @link https://developer.qiniu.com/kodo/api/data-format
      */
-    function entry($bucket, $key)
+    function entry($bucket, $key = null)
     {
         $en = $bucket;
-        if (!empty($key)) {
+        if ($key !== null) {
             $en = $bucket . ':' . $key;
         }
         return base64_urlSafeEncode($en);
diff --git a/tests/Qiniu/Tests/EntryTest.php b/tests/Qiniu/Tests/EntryTest.php
new file mode 100644
index 00000000..455deea5
--- /dev/null
+++ b/tests/Qiniu/Tests/EntryTest.php
@@ -0,0 +1,47 @@
+<?php
+namespace Qiniu\Tests;
+
+use Qiniu;
+
+class EntryTest extends \PHPUnit_Framework_TestCase
+{
+    public function testNormal()
+    {
+        $bucket = 'qiniuphotos';
+        $key = 'gogopher.jpg';
+        $encodeEntryURI = Qiniu\entry($bucket, $key);
+        $this->assertEquals('cWluaXVwaG90b3M6Z29nb3BoZXIuanBn', $encodeEntryURI);
+    }
+
+    public function testKeyEmpty()
+    {
+        $bucket = 'qiniuphotos';
+        $key = '';
+        $encodeEntryURI = Qiniu\entry($bucket, $key);
+        $this->assertEquals('cWluaXVwaG90b3M6', $encodeEntryURI);
+    }
+
+    public function testKeyNull()
+    {
+        $bucket = 'qiniuphotos';
+        $key = null;
+        $encodeEntryURI = Qiniu\entry($bucket, $key);
+        $this->assertEquals('cWluaXVwaG90b3M=', $encodeEntryURI);
+    }
+
+    public function testKeyNeedReplacePlusSymbol()
+    {
+        $bucket = 'qiniuphotos';
+        $key = '012ts>a';
+        $encodeEntryURI = Qiniu\entry($bucket, $key);
+        $this->assertEquals('cWluaXVwaG90b3M6MDEydHM-YQ==', $encodeEntryURI);
+    }
+
+    public function testKeyNeedReplaceSlashSymbol()
+    {
+        $bucket = 'qiniuphotos';
+        $key = '012ts?a';
+        $encodeEntryURI = Qiniu\entry($bucket, $key);
+        $this->assertEquals('cWluaXVwaG90b3M6MDEydHM_YQ==', $encodeEntryURI);
+    }
+}