diff --git a/module/instance/test/lib/instance.unittest.class.php b/module/instance/test/lib/instance.unittest.class.php
index 95cd5b7fec..91870fcd95 100644
--- a/module/instance/test/lib/instance.unittest.class.php
+++ b/module/instance/test/lib/instance.unittest.class.php
@@ -482,4 +482,20 @@ class instanceTest
 
         return $result;
     }
+
+    /**
+     * Test deleteBackup method.
+     *
+     * @param  object $instance
+     * @param  string $backupName
+     * @access public
+     * @return mixed
+     */
+    public function deleteBackupTest(object $instance, string $backupName)
+    {
+        $result = $this->objectModel->deleteBackup($instance, $backupName);
+        if(dao::isError()) return dao::getError();
+
+        return $result;
+    }
 }
\ No newline at end of file
diff --git a/module/instance/test/model/deletebackup.php b/module/instance/test/model/deletebackup.php
new file mode 100755
index 0000000000..83019273f9
--- /dev/null
+++ b/module/instance/test/model/deletebackup.php
@@ -0,0 +1,66 @@
+#!/usr/bin/env php
+<?php
+
+/**
+
+title=测试 instanceModel::deleteBackup();
+timeout=0
+cid=0
+
+- 步骤1：有效参数删除备份属性code @600
+- 步骤2：空备份名称属性code @600
+- 步骤3：不存在的备份名称属性code @600
+- 步骤4：无效实例属性code @600
+- 步骤5：特殊字符备份名称属性code @600
+
+*/
+
+// 1. 导入依赖（路径固定，不可修改）
+include dirname(__FILE__, 5) . '/test/lib/init.php';
+include dirname(__FILE__, 2) . '/lib/instance.unittest.class.php';
+
+// 2. zendata数据准备（根据需要配置）
+$instanceTable = zenData('instance');
+$instanceTable->id->range('1-10');
+$instanceTable->name->range('test-instance1,test-instance2,test-instance3,demo-instance1,demo-instance2');
+$instanceTable->domain->range('test1.example.com,test2.example.com,test3.example.com');
+$instanceTable->status->range('running,stopped,initializing');
+$instanceTable->chart->range('zentao,gitlab,jenkins');
+$instanceTable->deleted->range('0');
+$instanceTable->gen(10);
+
+$spaceTable = zenData('space');
+$spaceTable->id->range('1-5');
+$spaceTable->name->range('space1,space2,space3,space4,space5');
+$spaceTable->k8space->range('ns-1,ns-2,ns-3,ns-4,ns-5');
+$spaceTable->deleted->range('0');
+$spaceTable->gen(5);
+
+// 3. 用户登录（选择合适角色）
+su('admin');
+
+// 4. 创建测试实例（变量名与模块名一致）
+$instanceTest = new instanceTest();
+
+// 创建测试用的实例对象
+$validInstance = new stdClass();
+$validInstance->id = 1;
+$validInstance->name = 'test-instance';
+$validInstance->domain = 'test.example.com';
+$validInstance->chart = 'zentao';
+$validInstance->k8name = 'test-k8name';
+$validInstance->spaceData = new stdClass();
+$validInstance->spaceData->k8space = 'test-namespace';
+
+$invalidInstance = new stdClass();
+$invalidInstance->id = 0;
+$invalidInstance->spaceData = new stdClass();
+$invalidInstance->spaceData->k8space = 'invalid-namespace';
+$invalidInstance->k8name = 'invalid-k8name';
+
+// 5. 🔴 强制要求：必须包含至少5个测试步骤
+r($instanceTest->deleteBackupTest($validInstance, 'valid-backup-name')) && p('code') && e('600'); // 步骤1：有效参数删除备份
+r($instanceTest->deleteBackupTest($validInstance, '')) && p('code') && e('600'); // 步骤2：空备份名称
+r($instanceTest->deleteBackupTest($validInstance, 'nonexistent-backup')) && p('code') && e('600'); // 步骤3：不存在的备份名称
+r($instanceTest->deleteBackupTest($invalidInstance, 'backup-name')) && p('code') && e('600'); // 步骤4：无效实例
+r($instanceTest->deleteBackupTest($validInstance, 'backup-with-special-chars-@#$%')) && p('code') && e('600'); // 步骤5：特殊字符备份名称
\ No newline at end of file