diff --git a/database/seeders/AdminUserSeeder.php b/database/seeders/AdminUserSeeder.php
new file mode 100644
index 0000000..4bb1feb
--- /dev/null
+++ b/database/seeders/AdminUserSeeder.php
@@ -0,0 +1,38 @@
+<?php
+
+namespace Database\Seeders;
+
+use App\Models\User;
+use Illuminate\Database\Seeder;
+
+/**
+ * 管理員帳號 Seeder
+ * 
+ * 執行方式：php artisan db:seed --class=AdminUserSeeder
+ */
+class AdminUserSeeder extends Seeder
+{
+    /**
+     * Run the database seeds.
+     */
+    public function run(): void
+    {
+        // 檢查是否已存在 admin 帳號，避免重複建立
+        $admin = User::where('username', 'admin')->first();
+        
+        if ($admin) {
+            $this->command->info('Admin 帳號已存在，跳過建立。');
+            return;
+        }
+
+        User::create([
+            'username' => 'admin',
+            'name' => 'Admin',
+            'email' => 'admin@star-cloud.com',
+            'password' => bcrypt('password'),
+            'role' => 'admin',
+        ]);
+
+        $this->command->info('Admin 帳號建立成功！');
+    }
+}
diff --git a/database/seeders/DatabaseSeeder.php b/database/seeders/DatabaseSeeder.php
index 6f16585..238bbec 100644
--- a/database/seeders/DatabaseSeeder.php
+++ b/database/seeders/DatabaseSeeder.php
@@ -9,16 +9,14 @@ class DatabaseSeeder extends Seeder
 {
     /**
      * Seed the application's database.
+     * 
+     * 執行全部 Seeder：php artisan db:seed
+     * 執行單一 Seeder：php artisan db:seed --class=AdminUserSeeder
      */
     public function run(): void
     {
-        // 建立管理員帳號
-        \App\Models\User::factory()->create([
-            'username' => 'admin',
-            'name' => 'Admin',
-            'email' => 'admin@star-cloud.com',
-            'password' => bcrypt('password'),
-            'role' => 'admin',
+        $this->call([
+            AdminUserSeeder::class,
         ]);
     }
 }