diff --git a/backend/app/Controller/Api/V1/SkuMappingController.php b/backend/app/Controller/Api/V1/SkuMappingController.php
index 193a24a..28f36c7 100644
--- a/backend/app/Controller/Api/V1/SkuMappingController.php
+++ b/backend/app/Controller/Api/V1/SkuMappingController.php
@@ -50,6 +50,7 @@ class SkuMappingController extends AbstractController
             new OA\Parameter(name: 'platform_outer_sku', in: 'query', required: false, description: '平台侧 SKU 模糊搜索', schema: new OA\Schema(type: 'string')),
             new OA\Parameter(name: 'origin_sku_id', in: 'query', required: false, description: '内部 SKU ID 精确筛选', schema: new OA\Schema(type: 'integer')),
             new OA\Parameter(name: 'enabled', in: 'query', required: false, description: '启用状态', schema: new OA\Schema(type: 'boolean')),
+            new OA\Parameter(name: 'bundled', in: 'query', required: false, description: '组合商品映射筛选', schema: new OA\Schema(type: 'boolean')),
         ],
         responses: [
             new OA\Response(
@@ -76,7 +77,7 @@ class SkuMappingController extends AbstractController
         $query = SkuMapping::query()->select([
             'id', 'company_id', 'platform_id', 'store_id', 'origin_sku',
             'origin_sku_id', 'platform_outer_sku', 'platform_product_id',
-            'enabled', 'note', 'created_at', 'updated_at',
+            'enabled', 'bundled', 'note', 'created_at', 'updated_at',
         ]);
 
         $this->applyDataScope($query);
@@ -111,6 +112,11 @@ class SkuMappingController extends AbstractController
             $query->where('enabled', filter_var($enabled, FILTER_VALIDATE_BOOLEAN));
         }
 
+        $bundled = $this->request->input('bundled');
+        if ($bundled !== null && $bundled !== '') {
+            $query->where('bundled', filter_var($bundled, FILTER_VALIDATE_BOOLEAN));
+        }
+
         $query->orderBy('created_at', 'desc');
 
         $per_page = min(max((int) $this->request->input('per_page', 15), 1), 100);
@@ -337,18 +343,18 @@ class SkuMappingController extends AbstractController
         requestBody: new OA\RequestBody(
             required: true,
             content: new OA\JsonContent(
-                required: ['company_id', 'platform_id', 'origin_sku'],
+                required: ['company_id', 'platform_id', 'origin_sku_id', 'platform_outer_sku'],
                 properties: [
                     new OA\Property(property: 'company_id', type: 'integer', example: 3),
                     new OA\Property(property: 'platform_id', type: 'integer', example: 1),
                     new OA\Property(property: 'store_id', type: 'integer', nullable: true, example: 101),
-                    new OA\Property(property: 'origin_sku', type: 'string', example: '0032'),
-                    new OA\Property(property: 'origin_sku_id', type: 'integer', nullable: true, example: 1),
+                    new OA\Property(property: 'origin_sku_id', type: 'integer', example: 1),
+                    new OA\Property(property: 'platform_outer_sku', type: 'string', example: 'C03_0032'),
                     new OA\Property(property: 'platform_product_id', type: 'string', example: 'ITEM-001'),
-                    new OA\Property(property: 'platform_outer_sku', type: 'string', nullable: true, example: 'C03_0032'),
                     new OA\Property(property: 'generation_strategy', type: 'string', nullable: true, example: 'prefix:C03'),
                     new OA\Property(property: 'warehouse_id', type: 'integer', nullable: true),
                     new OA\Property(property: 'enabled', type: 'boolean', example: true),
+                    new OA\Property(property: 'bundled', type: 'boolean', example: false, description: '是否为组合商品映射'),
                     new OA\Property(property: 'note', type: 'string', nullable: true),
                 ]
             )
@@ -371,7 +377,7 @@ class SkuMappingController extends AbstractController
     {
         $data = $this->request->all();
 
-        $required_fields = ['company_id', 'platform_id', 'origin_sku'];
+        $required_fields = ['company_id', 'platform_id', 'origin_sku_id', 'platform_outer_sku'];
         foreach ($required_fields as $field) {
             if (!isset($data[$field]) || $data[$field] === '') {
                 return $this->response->json([
@@ -381,17 +387,37 @@ class SkuMappingController extends AbstractController
             }
         }
 
+        $origin_sku_id = (int) $data['origin_sku_id'];
+        $platform_id = (int) $data['platform_id'];
+        $platform_outer_sku = (string) $data['platform_outer_sku'];
+
+        $origin_sku = $this->skuService->autoFillOriginSku($origin_sku_id);
+        if ($origin_sku === null) {
+            return $this->response->json([
+                'code' => 422,
+                'message' => '指定的 origin_sku_id 不存在',
+            ])->withStatus(422);
+        }
+
+        if (!$this->skuService->isUniqueMapping($origin_sku_id, $platform_id, $platform_outer_sku)) {
+            return $this->response->json([
+                'code' => 422,
+                'message' => '该映射组合已存在（origin_sku_id + platform_id + platform_outer_sku）',
+            ])->withStatus(422);
+        }
+
         $record = SkuMapping::query()->create([
             'company_id' => (int) $data['company_id'],
-            'platform_id' => (int) $data['platform_id'],
+            'platform_id' => $platform_id,
             'store_id' => isset($data['store_id']) ? (int) $data['store_id'] : null,
-            'origin_sku' => $data['origin_sku'],
-            'origin_sku_id' => isset($data['origin_sku_id']) ? (int) $data['origin_sku_id'] : null,
+            'origin_sku' => $origin_sku,
+            'origin_sku_id' => $origin_sku_id,
             'platform_product_id' => $data['platform_product_id'] ?? null,
-            'platform_outer_sku' => $data['platform_outer_sku'] ?? null,
+            'platform_outer_sku' => $platform_outer_sku,
             'generation_strategy' => $data['generation_strategy'] ?? null,
             'warehouse_id' => isset($data['warehouse_id']) ? (int) $data['warehouse_id'] : null,
             'enabled' => $data['enabled'] ?? true,
+            'bundled' => (bool) ($data['bundled'] ?? false),
             'note' => $data['note'] ?? null,
         ]);
 
@@ -402,7 +428,7 @@ class SkuMappingController extends AbstractController
                 'create',
                 'sku_mapping',
                 $record->id,
-                '创建 SKU 映射: ' . $data['origin_sku'] . ' → ' . ($data['platform_outer_sku'] ?? 'N/A'),
+                '创建 SKU 映射: ' . $origin_sku . ' → ' . $platform_outer_sku,
                 ip: $this->request->getHeaderLine('x-real-ip') ?: null,
             );
         }
@@ -428,14 +454,15 @@ class SkuMappingController extends AbstractController
         requestBody: new OA\RequestBody(
             required: true,
             content: new OA\JsonContent(properties: [
-                new OA\Property(property: 'origin_sku', type: 'string'),
-                new OA\Property(property: 'origin_sku_id', type: 'integer', nullable: true),
+                new OA\Property(property: 'origin_sku_id', type: 'integer'),
+                new OA\Property(property: 'platform_id', type: 'integer'),
+                new OA\Property(property: 'platform_outer_sku', type: 'string'),
                 new OA\Property(property: 'platform_product_id', type: 'string'),
-                new OA\Property(property: 'platform_outer_sku', type: 'string', nullable: true),
                 new OA\Property(property: 'generation_strategy', type: 'string', nullable: true),
                 new OA\Property(property: 'store_id', type: 'integer', nullable: true),
                 new OA\Property(property: 'warehouse_id', type: 'integer', nullable: true),
                 new OA\Property(property: 'enabled', type: 'boolean'),
+                new OA\Property(property: 'bundled', type: 'boolean', description: '是否为组合商品映射'),
                 new OA\Property(property: 'note', type: 'string', nullable: true),
             ])
         ),
@@ -468,11 +495,41 @@ class SkuMappingController extends AbstractController
 
         $data = $this->request->all();
         $allowed_fields = [
-            'origin_sku', 'origin_sku_id', 'platform_product_id', 'platform_outer_sku',
-            'generation_strategy', 'store_id', 'warehouse_id', 'enabled', 'note',
+            'origin_sku_id', 'platform_id', 'platform_product_id', 'platform_outer_sku',
+            'generation_strategy', 'store_id', 'warehouse_id', 'enabled', 'bundled', 'note',
         ];
         $update_data = array_intersect_key($data, array_flip($allowed_fields));
 
+        $uniqueness_keys = ['origin_sku_id', 'platform_id', 'platform_outer_sku'];
+        if (array_intersect_key($update_data, array_flip($uniqueness_keys)) !== []) {
+            $next_origin_sku_id = (int) ($update_data['origin_sku_id'] ?? $record->origin_sku_id);
+            $next_platform_id = (int) ($update_data['platform_id'] ?? $record->platform_id);
+            $next_platform_outer_sku = (string) ($update_data['platform_outer_sku'] ?? $record->platform_outer_sku);
+
+            if (!$this->skuService->isUniqueMapping(
+                $next_origin_sku_id,
+                $next_platform_id,
+                $next_platform_outer_sku,
+                exclude_id: $record->id,
+            )) {
+                return $this->response->json([
+                    'code' => 422,
+                    'message' => '该映射组合已存在（origin_sku_id + platform_id + platform_outer_sku）',
+                ])->withStatus(422);
+            }
+        }
+
+        if (isset($update_data['origin_sku_id'])) {
+            $new_origin_sku = $this->skuService->autoFillOriginSku((int) $update_data['origin_sku_id']);
+            if ($new_origin_sku === null) {
+                return $this->response->json([
+                    'code' => 422,
+                    'message' => '指定的 origin_sku_id 不存在',
+                ])->withStatus(422);
+            }
+            $update_data['origin_sku'] = $new_origin_sku;
+        }
+
         $record->update($update_data);
 
         $user_id = OperationLogService::getCurrentUserId();
diff --git a/backend/app/Model/SkuMapping.php b/backend/app/Model/SkuMapping.php
index 5467b9d..edcc678 100644
--- a/backend/app/Model/SkuMapping.php
+++ b/backend/app/Model/SkuMapping.php
@@ -14,12 +14,13 @@ use OpenApi\Attributes as OA;
  * @property int $platform_id 平台 ID
  * @property string $platform_product_id 平台商品 ID
  * @property string $origin_sku 客户侧匹配的 SKU 编码
- * @property int|null $origin_sku_id 关联 skus_origin.id
- * @property string|null $platform_outer_sku 平台侧使用的 SKU 编码
+ * @property int $origin_sku_id 关联 skus_origin.id
+ * @property string $platform_outer_sku 平台侧使用的 SKU 编码
  * @property string|null $generation_strategy 生成策略记录
  * @property int|null $store_id 店铺 ID
  * @property int|null $warehouse_id 仓库 ID
  * @property boolean $enabled 是否启用
+ * @property boolean $bundled 是否为组合商品映射
  * @property string|null $note 备注
  * @property \Carbon\Carbon $created_at
  * @property \Carbon\Carbon $updated_at
@@ -33,12 +34,13 @@ use OpenApi\Attributes as OA;
         new OA\Property(property: 'platform_id', type: 'integer', example: 1),
         new OA\Property(property: 'platform_product_id', type: 'string', example: 'ITEM-001'),
         new OA\Property(property: 'origin_sku', type: 'string', example: '0032'),
-        new OA\Property(property: 'origin_sku_id', type: 'integer', nullable: true, example: 1),
-        new OA\Property(property: 'platform_outer_sku', type: 'string', nullable: true, example: 'C03_0032'),
+        new OA\Property(property: 'origin_sku_id', type: 'integer', example: 1),
+        new OA\Property(property: 'platform_outer_sku', type: 'string', example: 'C03_0032'),
         new OA\Property(property: 'generation_strategy', type: 'string', nullable: true, example: 'prefix:C03'),
         new OA\Property(property: 'store_id', type: 'integer', nullable: true, example: 101),
         new OA\Property(property: 'warehouse_id', type: 'integer', nullable: true, example: 1),
         new OA\Property(property: 'enabled', type: 'boolean', example: true),
+        new OA\Property(property: 'bundled', type: 'boolean', example: false, description: '是否为组合商品映射'),
         new OA\Property(property: 'note', type: 'string', nullable: true, example: '用于 Shopee 马来站'),
         new OA\Property(property: 'created_at', type: 'string', format: 'date-time'),
         new OA\Property(property: 'updated_at', type: 'string', format: 'date-time'),
@@ -65,6 +67,7 @@ class SkuMapping extends Model
         'store_id',
         'warehouse_id',
         'enabled',
+        'bundled',
         'note',
     ];
 
@@ -79,6 +82,7 @@ class SkuMapping extends Model
         'store_id' => 'integer',
         'warehouse_id' => 'integer',
         'enabled' => 'boolean',
+        'bundled' => 'boolean',
         'created_at' => 'datetime',
         'updated_at' => 'datetime',
     ];
diff --git a/backend/app/Service/SkuService.php b/backend/app/Service/SkuService.php
index 1b4a925..feb5fdb 100644
--- a/backend/app/Service/SkuService.php
+++ b/backend/app/Service/SkuService.php
@@ -102,6 +102,37 @@ class SkuService
         ];
     }
 
+    /**
+     * 唯一性检查：匹配数据库新唯一索引 (origin_sku_id, platform_id, platform_outer_sku)
+     *
+     * 用于 create/update 前的预检，避免击中索引冲突返回 500
+     */
+    public function isUniqueMapping(
+        int $origin_sku_id,
+        int $platform_id,
+        string $platform_outer_sku,
+        ?int $exclude_id = null,
+    ): bool {
+        $query = SkuMapping::query()
+            ->where('origin_sku_id', $origin_sku_id)
+            ->where('platform_id', $platform_id)
+            ->where('platform_outer_sku', $platform_outer_sku);
+
+        if ($exclude_id !== null) {
+            $query->where('id', '!=', $exclude_id);
+        }
+
+        return !$query->exists();
+    }
+
+    /**
+     * 读取 skus_origin.sku，用作 skus_mapping.origin_sku 快照值
+     */
+    public function autoFillOriginSku(int $origin_sku_id): ?string
+    {
+        return SkuOrigin::query()->find($origin_sku_id)?->sku;
+    }
+
     /**
      * 检查 origin_sku 是否有映射引用（用于删除前检查）
      */
@@ -111,20 +142,4 @@ class SkuService
             ->where('origin_sku_id', $origin_sku_id)
             ->exists();
     }
-
-    /**
-     * 检查 platform_outer_sku 在指定平台内是否唯一
-     */
-    public function isPlatformOuterSkuUnique(string $platform_outer_sku, int $platform_id, ?int $exclude_id = null): bool
-    {
-        $query = SkuMapping::query()
-            ->where('platform_outer_sku', $platform_outer_sku)
-            ->where('platform_id', $platform_id);
-
-        if ($exclude_id !== null) {
-            $query->where('id', '!=', $exclude_id);
-        }
-
-        return !$query->exists();
-    }
 }
diff --git a/backend/test/Cases/Integration/Sku/SkuMappingControllerTest.php b/backend/test/Cases/Integration/Sku/SkuMappingControllerTest.php
index a4922ca..a26c800 100644
--- a/backend/test/Cases/Integration/Sku/SkuMappingControllerTest.php
+++ b/backend/test/Cases/Integration/Sku/SkuMappingControllerTest.php
@@ -182,7 +182,8 @@ class SkuMappingControllerTest extends TestCase
     {
         $response = $this->post('/api/v1/sku-mappings', [
             'platform_id' => 1,
-            'origin_sku' => 'TEST-SKU',
+            'origin_sku_id' => 1,
+            'platform_outer_sku' => 'TEST-SKU',
         ], $this->authHeaders());
 
         $response->assertStatus(422);
@@ -192,17 +193,30 @@ class SkuMappingControllerTest extends TestCase
     {
         $response = $this->post('/api/v1/sku-mappings', [
             'company_id' => 1,
-            'origin_sku' => 'TEST-SKU',
+            'origin_sku_id' => 1,
+            'platform_outer_sku' => 'TEST-SKU',
         ], $this->authHeaders());
 
         $response->assertStatus(422);
     }
 
-    public function test_create_requires_origin_sku(): void
+    public function test_create_requires_origin_sku_id(): void
     {
         $response = $this->post('/api/v1/sku-mappings', [
             'company_id' => 1,
             'platform_id' => 1,
+            'platform_outer_sku' => 'TEST-SKU',
+        ], $this->authHeaders());
+
+        $response->assertStatus(422);
+    }
+
+    public function test_create_requires_platform_outer_sku(): void
+    {
+        $response = $this->post('/api/v1/sku-mappings', [
+            'company_id' => 1,
+            'platform_id' => 1,
+            'origin_sku_id' => 1,
         ], $this->authHeaders());
 
         $response->assertStatus(422);