diff --git a/app/admin/service/BrandSeriesService.php b/app/admin/service/BrandSeriesService.php
index 21760c3..bc9d11b 100644
--- a/app/admin/service/BrandSeriesService.php
+++ b/app/admin/service/BrandSeriesService.php
@@ -3,6 +3,7 @@
 namespace app\admin\service;
 
 use app\admin\validate\BrandSeriesValidate;
+use app\common\model\Brand;
 use app\common\traits\crud\CrudServiceTrait;
 use app\common\model\BrandSeries;
 use support\Request;
@@ -77,4 +78,49 @@ class BrandSeriesService
 
         return $config;
     }
+
+    /**
+     * 生成唯一的7位颜色编码
+     * 格式：C + (O/I) + 5位字母数字组合
+     *
+     * @param int $type 类型
+     * @return string 7位唯一编码
+     */
+    public function generateUniqueModificationCode($brand_id)
+    {
+        $chars = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ';
+        $maxAttempts = 10; // 防止无限循环
+
+        $brand_code = Brand::where('id', $brand_id)->value('brand_code');
+        $brand_code = $brand_code??'BS';
+        for ($attempt = 0; $attempt < $maxAttempts; $attempt++) {
+            // 生成后5位随机字符
+            $suffix = '';
+            for ($i = 0; $i < 6; $i++) {
+                $suffix .= $chars[rand(0, strlen($chars) - 1)];
+            }
+
+            $code = $brand_code . $suffix;
+
+            // 检查是否已存在
+            $existing = BrandSeries::where('series_code', $code)->first();
+            if (!$existing) {
+                return $code;
+            }
+        }
+
+        // 如果1000次尝试后仍然重复，使用时间戳确保唯一性
+        $timestamp = substr(time(), -6);
+        return $brand_code . $timestamp;
+    }
+
+    /**
+     * 添加前置处理
+     */
+    public function beforeServiceStore($data, Request $request)
+    {
+        $brand_id = $data['brand_id'] ?? 0;
+        $data['series_code'] = $this->generateUniqueModificationCode($brand_id);
+        return $data;
+    }
 }
\ No newline at end of file