diff --git a/app/admin/apis/shopee_product.go b/app/admin/apis/shopee_product.go
index 5e53ca7..ce80d5e 100644
--- a/app/admin/apis/shopee_product.go
+++ b/app/admin/apis/shopee_product.go
@@ -137,6 +137,32 @@ func (e ShopeeProduct) SyncWaitByShopeeID(c *gin.Context) {
 	e.getByShopeeID(c, true, true)
 }
 
+// SyncIfStaleByShopeeID synchronizes only when the local sync timestamp is
+// older than staleDays (or no local product has been synchronized yet).
+func (e ShopeeProduct) SyncIfStaleByShopeeID(c *gin.Context) {
+	e.MakeContext(c)
+	staleDays := 1
+	if raw := strings.TrimSpace(c.Query("staleDays")); raw != "" {
+		value, err := strconv.Atoi(raw)
+		if err != nil || value < 0 || value > 3650 {
+			e.Error(400, fmt.Errorf("staleDays must be between 0 and 3650"), "参数错误")
+			return
+		}
+		staleDays = value
+	}
+	db := primaryDB()
+	if db == nil {
+		e.Error(500, fmt.Errorf("database is not initialized"), "数据库未初始化")
+		return
+	}
+	var row models.ShopeeProduct
+	needsSync := true
+	if err := db.Where("shopee_id = ?", strings.TrimSpace(c.Param("shopeeId"))).First(&row).Error; err == nil && row.LastSyncedAt != nil {
+		needsSync = time.Since(*row.LastSyncedAt) >= time.Duration(staleDays)*24*time.Hour
+	}
+	e.getByShopeeID(c, true, needsSync)
+}
+
 // SyncStatus returns the current asynchronous refresh state.
 func (e ShopeeProduct) SyncStatus(c *gin.Context) {
 	e.MakeContext(c)
@@ -185,6 +211,7 @@ func (e ShopeeProduct) getByShopeeID(c *gin.Context, requireAPIKey bool, syncSho
 	ctx, cancel := context.WithTimeout(c.Request.Context(), 120*time.Second)
 	defer cancel()
 	want := strings.TrimSpace(c.Param("shopeeId"))
+	var syncedAt *time.Time
 	if want == "" {
 		e.Error(400, fmt.Errorf("shopeeId is required"), "参数错误")
 		return
@@ -249,6 +276,9 @@ func (e ShopeeProduct) getByShopeeID(c *gin.Context, requireAPIKey bool, syncSho
 			e.Error(502, err, "Shopee 商品同步失败："+err.Error())
 			return
 		}
+		now := time.Now()
+		syncedAt = &now
+		db.Model(&models.ShopeeProduct{}).Where("shopee_id = ?", want).Update("last_synced_at", now)
 		// The sync task updates the ERP asynchronously. Locate the record again so
 		// getDetail uses the current Huohanhan internal ID and metadata.
 		page, err = client.GetProductPage(ctx, huohanhan.ProductPageParams{
@@ -307,6 +337,7 @@ func (e ShopeeProduct) getByShopeeID(c *gin.Context, requireAPIKey bool, syncSho
 	platformInfo, _ := detail.PlatformInfo()
 	platformInfoObject, _ := detailObject(platformInfo)
 	row := models.ShopeeProduct{ShopeeID: want, Payload: string(detail.RawJSON())}
+	row.LastSyncedAt = syncedAt
 	row.ItemName = firstNonEmpty(detailString(itemInfoObject, "itemName"), record.ItemName)
 	row.ShopName = firstNonEmpty(detailString(platformInfoObject, "shopName"), record.ShopName)
 	row.Status = firstNonEmpty(detailString(itemInfoObject, "itemStatus"), record.ItemStatus)
diff --git a/app/admin/models/shopee_product.go b/app/admin/models/shopee_product.go
index f0f57fa..05e7153 100644
--- a/app/admin/models/shopee_product.go
+++ b/app/admin/models/shopee_product.go
@@ -1,6 +1,9 @@
 package models
 
-import "go-admin/common/models"
+import (
+	"go-admin/common/models"
+	"time"
+)
 
 type ShopeeProduct struct {
 	models.Model
@@ -10,7 +13,8 @@ type ShopeeProduct struct {
 	Status   string `json:"status" gorm:"size:64"`
 	// Detail responses include images, variants, logistics and descriptions;
 	// some real responses exceed MySQL TEXT's 65,535-byte limit.
-	Payload string `json:"payload" gorm:"type:longtext"`
+	Payload      string     `json:"payload" gorm:"type:longtext"`
+	LastSyncedAt *time.Time `json:"lastSyncedAt"`
 	models.ModelTime
 	models.ControlBy
 }
diff --git a/app/admin/router/shopee_product.go b/app/admin/router/shopee_product.go
index 6c5802e..a82413e 100644
--- a/app/admin/router/shopee_product.go
+++ b/app/admin/router/shopee_product.go
@@ -16,6 +16,7 @@ func registerShopeeProductRouter(v1 *gin.RouterGroup) {
 	v1.GET("/shopee/products/:shopeeId", a.GetByShopeeID)
 	v1.POST("/shopee/products/:shopeeId/sync", a.SyncByShopeeID)
 	v1.POST("/shopee/products/:shopeeId/sync-wait", a.SyncWaitByShopeeID)
+	v1.POST("/shopee/products/:shopeeId/sync-if-stale", a.SyncIfStaleByShopeeID)
 	v1.GET("/shopee/products/:shopeeId/sync-status", a.SyncStatus)
 }
 func registerShopeeProductAdminRouter(v1 *gin.RouterGroup, auth *jwt.GinJWTMiddleware) {
diff --git a/tickets/LOCAL-012-shopee-sync-if-stale.md b/tickets/LOCAL-012-shopee-sync-if-stale.md
new file mode 100644
index 0000000..d9c816d
--- /dev/null
+++ b/tickets/LOCAL-012-shopee-sync-if-stale.md
@@ -0,0 +1,17 @@
+# LOCAL-012：Shopee 商品条件同步查询
+
+- 状态：待验收
+- 目标：按指定天数判断商品是否需要先同步，再获取最新 detail。
+
+## 接口
+
+`POST /api/v1/shopee/products/{shopeeId}/sync-if-stale?staleDays=1`
+
+支持 API Key 查询参数或请求头。没有本地同步记录，或 `lastSyncedAt` 超过指定天数时同步；否则直接读取 detail。默认 `staleDays=1`，允许 0 至 3650。
+
+## 实施
+
+- 新增 `shopee_product.last_synced_at` 字段。
+- 同步完成后记录同步时间。
+- 保留 `GET`、`/sync`、`/sync-wait` 和 `/sync-status` 原有语义。
+- 验证：`go test ./app/admin/apis ./app/admin/router ./internal/huohanhan` 通过。