diff --git a/database/migrations/20190508100337_admin_auth_group_access.php b/database/migrations/20190508100337_admin_auth_group_access.php
new file mode 100644
index 0000000..d52c5b3
--- /dev/null
+++ b/database/migrations/20190508100337_admin_auth_group_access.php
@@ -0,0 +1,44 @@
+<?php
+
+use think\migration\Migrator;
+use think\migration\db\Column;
+
+class AdminAuthGroupAccess extends Migrator {
+    /**
+     * Change Method.
+     *
+     * Write your reversible migrations using this method.
+     *
+     * More information on writing migrations is available here:
+     * http://docs.phinx.org/en/latest/migrations.html#the-abstractmigration-class
+     *
+     * The following commands can be used in this method and Phinx will
+     * automatically reverse them when rolling back:
+     *
+     *    createTable
+     *    renameTable
+     *    addColumn
+     *    renameColumn
+     *    addIndex
+     *    addForeignKey
+     *
+     * Remember to call "create()" or "update()" and NOT "save()" when working
+     * with the Table class.
+     */
+    public function change() {
+        $table = $this->table('admin_auth_group_access', [
+            'comment' => '用户和组的对应关系'
+        ])->setCollation('utf8mb4_general_ci');
+        $table->addColumn('uid', 'integer', [
+            'limit'   => 11,
+            'default' => 0,
+            'comment' => ''
+        ])->addColumn('groupId', 'string', [
+            'limit'   => 255,
+            'default' => '',
+            'comment' => ''
+        ])->addIndex(['uid'])->addIndex(['groupId'])->create();
+
+        $table->changeColumn('id', 'integer', ['signed' => false]);
+    }
+}