diff --git a/backend/migrations/2025_12_10_105639_update_orders_add_buyer_user_id.php b/backend/migrations/2025_12_10_105639_update_orders_add_buyer_user_id.php
new file mode 100644
index 0000000..6a57f0a
--- /dev/null
+++ b/backend/migrations/2025_12_10_105639_update_orders_add_buyer_user_id.php
@@ -0,0 +1,28 @@
+<?php
+
+use Hyperf\Database\Schema\Schema;
+use Hyperf\Database\Schema\Blueprint;
+use Hyperf\Database\Migrations\Migration;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::table('orders', function (Blueprint $table) {
+            $table->text('buyer_user_id')->nullable()->default(null)->comment('平台买家 id');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('orders', function (Blueprint $table) {
+            $table->dropColumn('buyer_user_id');
+        });
+    }
+};