diff --git a/app/Modules/Inventory/Controllers/ProductController.php b/app/Modules/Inventory/Controllers/ProductController.php
index 71650be..ee67217 100644
--- a/app/Modules/Inventory/Controllers/ProductController.php
+++ b/app/Modules/Inventory/Controllers/ProductController.php
@@ -114,7 +114,7 @@ class ProductController extends Controller
     public function store(Request $request)
     {
         $validated = $request->validate([
-            'code' => 'required|string|min:1|max:5|unique:products,code',
+            'code' => 'required|string|min:2|max:8|unique:products,code',
             'barcode' => 'required|string|unique:products,barcode',
             'name' => 'required|string|max:255',
             'category_id' => 'required|exists:categories,id',
@@ -127,8 +127,8 @@ class ProductController extends Controller
             'purchase_unit_id' => 'nullable|exists:units,id',
         ], [
             'code.required' => '商品代號為必填',
-            'code.max' => '商品代號最多 5 碼',
-            'code.min' => '商品代號最少 1 碼',
+            'code.max' => '商品代號最多 8 碼',
+            'code.min' => '商品代號最少 2 碼',
             'code.unique' => '商品代號已存在',
             'barcode.required' => '條碼編號為必填',
             'barcode.unique' => '條碼編號已存在',
@@ -153,7 +153,7 @@ class ProductController extends Controller
     public function update(Request $request, Product $product)
     {
         $validated = $request->validate([
-            'code' => 'required|string|min:1|max:5|unique:products,code,' . $product->id,
+            'code' => 'required|string|min:2|max:8|unique:products,code,' . $product->id,
             'barcode' => 'required|string|unique:products,barcode,' . $product->id,
             'name' => 'required|string|max:255',
             'category_id' => 'required|exists:categories,id',
@@ -165,8 +165,8 @@ class ProductController extends Controller
             'purchase_unit_id' => 'nullable|exists:units,id',
         ], [
             'code.required' => '商品代號為必填',
-            'code.max' => '商品代號最多 5 碼',
-            'code.min' => '商品代號最少 1 碼',
+            'code.max' => '商品代號最多 8 碼',
+            'code.min' => '商品代號最少 2 碼',
             'code.unique' => '商品代號已存在',
             'barcode.required' => '條碼編號為必填',
             'barcode.unique' => '條碼編號已存在',
diff --git a/app/Modules/Inventory/Imports/ProductImport.php b/app/Modules/Inventory/Imports/ProductImport.php
index cfc62a8..8f7e7dc 100644
--- a/app/Modules/Inventory/Imports/ProductImport.php
+++ b/app/Modules/Inventory/Imports/ProductImport.php
@@ -80,7 +80,7 @@ class ProductImport implements ToModel, WithHeadingRow, WithValidation, WithMapp
     public function rules(): array
     {
         return [
-            '商品代號' => ['required', 'string', 'min:1', 'max:5', 'unique:products,code'],
+            '商品代號' => ['required', 'string', 'min:2', 'max:8', 'unique:products,code'],
             '條碼' => ['required', 'string', 'unique:products,barcode'],
             '商品名稱' => ['required', 'string'],
             '類別名稱' => ['required', function($attribute, $value, $fail) {
diff --git a/resources/js/Components/Product/ProductDialog.tsx b/resources/js/Components/Product/ProductDialog.tsx
index 2dc998f..d0ce95e 100644
--- a/resources/js/Components/Product/ProductDialog.tsx
+++ b/resources/js/Components/Product/ProductDialog.tsx
@@ -160,8 +160,8 @@ export default function ProductDialog({
                   id="code"
                   value={data.code}
                   onChange={(e) => setData("code", e.target.value)}
-                  placeholder="例：A1 (最多2碼)"
-                  maxLength={2}
+                  placeholder="例：A1 (2-8碼)"
+                  maxLength={8}
                   className={errors.code ? "border-red-500" : ""}
                 />
                 {errors.code && <p className="text-sm text-red-500">{errors.code}</p>}
diff --git a/resources/js/Components/Product/ProductImportDialog.tsx b/resources/js/Components/Product/ProductImportDialog.tsx
index eab852b..cc66e07 100644
--- a/resources/js/Components/Product/ProductImportDialog.tsx
+++ b/resources/js/Components/Product/ProductImportDialog.tsx
@@ -111,7 +111,7 @@ export default function ProductImportDialog({ open, onOpenChange }: ProductImpor
               <AccordionContent>
                 <div className="text-sm text-gray-600 space-y-2 pb-2 pl-6">
                   <ul className="list-disc space-y-1">
-                    <li><span className="font-medium text-gray-700">必填欄位</span>：商品代號 (1-5 碼)、條碼、商品名稱、類別名稱、基本單位。</li>
+                    <li><span className="font-medium text-gray-700">必填欄位</span>：商品代號 (2-8 碼)、條碼、商品名稱、類別名稱、基本單位。</li>
                     <li><span className="font-medium text-gray-700">唯一性</span>：商品代號與條碼不可與現有資料重複。</li>
                     <li><span className="font-medium text-gray-700">自動關聯</span>：類別與單位請填寫系統當前存在的「名稱」（如：飲品、瓶）。</li>
                     <li><span className="font-medium text-gray-700">大單位</span>：若填寫大單位，則「換算率」為必填（需大於 0）。</li>