diff --git a/db.sql b/db.sql
index 198f297..c8867a0 100644
--- a/db.sql
+++ b/db.sql
@@ -1413,6 +1413,9 @@ CREATE TABLE `c_sku` (
   `ExHsCode` VARCHAR(64) NULL COMMENT '出口HSCode',
   `ImHsCode` VARCHAR(64) NULL COMMENT '进口HSCode',
   `DeclareElement` VARCHAR(255) NULL COMMENT '出口申报要素',
+  `ProductId` VARCHAR(100) NULL COMMENT '产品标识编码',
+  `NonStdProductId` VARCHAR(100) NULL COMMENT '非标产品标识编码',
+  `StdProductId` VARCHAR(100) NULL COMMENT '标准产品标识编码',
   `WeightG` DECIMAL(10,2) NULL COMMENT '重量(g)',
   `LengthCm` DECIMAL(10,2) NULL COMMENT '长(cm)',
   `WidthCm` DECIMAL(10,2) NULL COMMENT '宽(cm)',
diff --git a/sql/migrate_c_sku_product_ids_20261023.sql b/sql/migrate_c_sku_product_ids_20261023.sql
new file mode 100644
index 0000000..ff50289
--- /dev/null
+++ b/sql/migrate_c_sku_product_ids_20261023.sql
@@ -0,0 +1,55 @@
+-- c_sku：新增产品标识编码 / 非标产品标识编码 / 标准产品标识编码（对齐订单申报明细）。
+-- 可重复执行。
+
+SET @db := DATABASE();
+
+-- c_sku.ProductId
+SET @exists := (
+  SELECT COUNT(1)
+  FROM information_schema.COLUMNS
+  WHERE TABLE_SCHEMA = @db
+    AND TABLE_NAME = 'c_sku'
+    AND COLUMN_NAME = 'ProductId'
+);
+SET @sql := IF(
+  @exists = 0,
+  'ALTER TABLE `c_sku` ADD COLUMN `ProductId` VARCHAR(100) NULL COMMENT ''产品标识编码'' AFTER `DeclareElement`',
+  'SELECT ''c_sku.ProductId already exists'' AS info'
+);
+PREPARE stmt FROM @sql;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;
+
+-- c_sku.NonStdProductId
+SET @exists := (
+  SELECT COUNT(1)
+  FROM information_schema.COLUMNS
+  WHERE TABLE_SCHEMA = @db
+    AND TABLE_NAME = 'c_sku'
+    AND COLUMN_NAME = 'NonStdProductId'
+);
+SET @sql := IF(
+  @exists = 0,
+  'ALTER TABLE `c_sku` ADD COLUMN `NonStdProductId` VARCHAR(100) NULL COMMENT ''非标产品标识编码'' AFTER `ProductId`',
+  'SELECT ''c_sku.NonStdProductId already exists'' AS info'
+);
+PREPARE stmt FROM @sql;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;
+
+-- c_sku.StdProductId
+SET @exists := (
+  SELECT COUNT(1)
+  FROM information_schema.COLUMNS
+  WHERE TABLE_SCHEMA = @db
+    AND TABLE_NAME = 'c_sku'
+    AND COLUMN_NAME = 'StdProductId'
+);
+SET @sql := IF(
+  @exists = 0,
+  'ALTER TABLE `c_sku` ADD COLUMN `StdProductId` VARCHAR(100) NULL COMMENT ''标准产品标识编码'' AFTER `NonStdProductId`',
+  'SELECT ''c_sku.StdProductId already exists'' AS info'
+);
+PREPARE stmt FROM @sql;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;
diff --git a/src/Oms.Application/Dtos/Orders/OrderParcelItemInput.cs b/src/Oms.Application/Dtos/Orders/OrderParcelItemInput.cs
index ed71218..6ce63c7 100644
--- a/src/Oms.Application/Dtos/Orders/OrderParcelItemInput.cs
+++ b/src/Oms.Application/Dtos/Orders/OrderParcelItemInput.cs
@@ -1,4 +1,5 @@
 using System.ComponentModel.DataAnnotations;
+using System.Text.Json.Serialization;
 
 namespace Oms.Application.Dtos.Orders;
 
@@ -68,21 +69,24 @@ public class OrderParcelItemInput
     public string? DeclareElement { get; set; }
 
     /// <summary>
-    /// 产品标识编码（选填）。
+    /// 产品标识编码（选填）。预报下游始终序列化，无值时为 null。
     /// </summary>
     [StringLength(100)]
+    [JsonIgnore(Condition = JsonIgnoreCondition.Never)]
     public string? ProductId { get; set; }
 
     /// <summary>
-    /// 非标产品标识编码（选填）。
+    /// 非标产品标识编码（选填）。预报下游始终序列化，无值时为 null。
     /// </summary>
     [StringLength(100)]
+    [JsonIgnore(Condition = JsonIgnoreCondition.Never)]
     public string? NonStdProductId { get; set; }
 
     /// <summary>
-    /// 标准产品标识编码（选填）。
+    /// 标准产品标识编码（选填）。预报下游始终序列化，无值时为 null。
     /// </summary>
     [StringLength(100)]
+    [JsonIgnore(Condition = JsonIgnoreCondition.Never)]
     public string? StdProductId { get; set; }
 
     /// <summary>
diff --git a/src/Oms.Application/Dtos/Warehouse/WarehouseDtos.cs b/src/Oms.Application/Dtos/Warehouse/WarehouseDtos.cs
index 47b6cff..630cb9a 100644
--- a/src/Oms.Application/Dtos/Warehouse/WarehouseDtos.cs
+++ b/src/Oms.Application/Dtos/Warehouse/WarehouseDtos.cs
@@ -47,6 +47,21 @@ public class WarehouseSkuOutput
     /// </summary>
     public string? DeclareElement { get; set; }
 
+    /// <summary>
+    /// 产品标识编码。
+    /// </summary>
+    public string? ProductId { get; set; }
+
+    /// <summary>
+    /// 非标产品标识编码。
+    /// </summary>
+    public string? NonStdProductId { get; set; }
+
+    /// <summary>
+    /// 标准产品标识编码（如 GTIN / UPC / EAN）。
+    /// </summary>
+    public string? StdProductId { get; set; }
+
     public decimal? WeightG { get; set; }
 
     public decimal? LengthCm { get; set; }
@@ -91,6 +106,21 @@ public class WarehouseSkuSaveInput
     /// </summary>
     public string? DeclareElement { get; set; }
 
+    /// <summary>
+    /// 产品标识编码。
+    /// </summary>
+    public string? ProductId { get; set; }
+
+    /// <summary>
+    /// 非标产品标识编码。
+    /// </summary>
+    public string? NonStdProductId { get; set; }
+
+    /// <summary>
+    /// 标准产品标识编码（如 GTIN / UPC / EAN）。
+    /// </summary>
+    public string? StdProductId { get; set; }
+
     public decimal? WeightG { get; set; }
 
     public decimal? LengthCm { get; set; }
diff --git a/src/Oms.Application/Labeling/SkuLabelPrintDataBuilder.cs b/src/Oms.Application/Labeling/SkuLabelPrintDataBuilder.cs
index 30b459c..4086a85 100644
--- a/src/Oms.Application/Labeling/SkuLabelPrintDataBuilder.cs
+++ b/src/Oms.Application/Labeling/SkuLabelPrintDataBuilder.cs
@@ -29,6 +29,9 @@ public static class SkuLabelPrintDataBuilder
             ["exHsCode"] = sku.ExHsCode,
             ["imHsCode"] = sku.ImHsCode,
             ["declareElement"] = sku.DeclareElement,
+            ["productId"] = sku.ProductId,
+            ["nonStdProductId"] = sku.NonStdProductId,
+            ["stdProductId"] = sku.StdProductId,
             ["weightG"] = sku.WeightG,
             ["lengthCm"] = sku.LengthCm,
             ["widthCm"] = sku.WidthCm,
@@ -61,6 +64,9 @@ public static class SkuLabelPrintDataBuilder
             ["exHsCode"] = "610910",
             ["imHsCode"] = "610910",
             ["declareElement"] = "棉质 T 恤",
+            ["productId"] = null,
+            ["nonStdProductId"] = null,
+            ["stdProductId"] = "06901234567890",
             ["weightG"] = 200m,
             ["lengthCm"] = 30m,
             ["widthCm"] = 20m,
diff --git a/src/Oms.Application/Services/Orders/PlatformStoreOrderParcelBuilder.cs b/src/Oms.Application/Services/Orders/PlatformStoreOrderParcelBuilder.cs
index 1e460e5..6530da0 100644
--- a/src/Oms.Application/Services/Orders/PlatformStoreOrderParcelBuilder.cs
+++ b/src/Oms.Application/Services/Orders/PlatformStoreOrderParcelBuilder.cs
@@ -267,7 +267,9 @@ public static class PlatformStoreOrderParcelBuilder
             var unitWeightKg = sku.WeightG is > 0 ? Math.Max(sku.WeightG.Value / 1000m, MinActualWeightKg) : MinActualWeightKg;
             var unitPrice = line.UnitPrice is > 0 ? line.UnitPrice.Value : 1m;
             var cnName = string.IsNullOrWhiteSpace(line.ProductName) ? sku.SkuName : line.ProductName.Trim();
-            var enName = string.IsNullOrWhiteSpace(sku.SkuName) ? cnName : sku.SkuName;
+            var enName = string.IsNullOrWhiteSpace(sku.SkuNameEn)
+                ? (string.IsNullOrWhiteSpace(sku.SkuName) ? cnName : sku.SkuName)
+                : sku.SkuNameEn.Trim();
 
             items.Add(new OrderParcelItemInput
             {
@@ -279,7 +281,13 @@ public static class PlatformStoreOrderParcelBuilder
                 UnitWeight = unitWeightKg,
                 Quantity = line.Quantity,
                 Amount = unitPrice * line.Quantity,
-                Weight = unitWeightKg * line.Quantity
+                Weight = unitWeightKg * line.Quantity,
+                ExHsCode = sku.ExHsCode,
+                ImHsCode = sku.ImHsCode,
+                DeclareElement = sku.DeclareElement,
+                ProductId = sku.ProductId,
+                NonStdProductId = sku.NonStdProductId,
+                StdProductId = sku.StdProductId,
             });
         }
 
diff --git a/src/Oms.Application/Services/Warehouse/WarehouseService.Sku.cs b/src/Oms.Application/Services/Warehouse/WarehouseService.Sku.cs
index 991a6d0..599c21b 100644
--- a/src/Oms.Application/Services/Warehouse/WarehouseService.Sku.cs
+++ b/src/Oms.Application/Services/Warehouse/WarehouseService.Sku.cs
@@ -139,6 +139,11 @@ public partial class WarehouseService
         entity.ExHsCode = string.IsNullOrWhiteSpace(input.ExHsCode) ? null : input.ExHsCode.Trim();
         entity.ImHsCode = string.IsNullOrWhiteSpace(input.ImHsCode) ? null : input.ImHsCode.Trim();
         entity.DeclareElement = string.IsNullOrWhiteSpace(input.DeclareElement) ? null : input.DeclareElement.Trim();
+        entity.ProductId = string.IsNullOrWhiteSpace(input.ProductId) ? null : input.ProductId.Trim();
+        entity.NonStdProductId = string.IsNullOrWhiteSpace(input.NonStdProductId)
+            ? null
+            : input.NonStdProductId.Trim();
+        entity.StdProductId = string.IsNullOrWhiteSpace(input.StdProductId) ? null : input.StdProductId.Trim();
         entity.WeightG = input.WeightG;
         entity.LengthCm = input.LengthCm;
         entity.WidthCm = input.WidthCm;
@@ -309,6 +314,9 @@ public partial class WarehouseService
             ExHsCode = entity.ExHsCode,
             ImHsCode = entity.ImHsCode,
             DeclareElement = entity.DeclareElement,
+            ProductId = entity.ProductId,
+            NonStdProductId = entity.NonStdProductId,
+            StdProductId = entity.StdProductId,
             WeightG = entity.WeightG,
             LengthCm = entity.LengthCm,
             WidthCm = entity.WidthCm,
@@ -331,6 +339,9 @@ public partial class WarehouseService
             ExHsCode = entity.ExHsCode,
             ImHsCode = entity.ImHsCode,
             DeclareElement = entity.DeclareElement,
+            ProductId = entity.ProductId,
+            NonStdProductId = entity.NonStdProductId,
+            StdProductId = entity.StdProductId,
             WeightG = entity.WeightG,
             LengthCm = entity.LengthCm,
             WidthCm = entity.WidthCm,
diff --git a/src/Oms.Application/Shared/OrderDownstreamCreateOneBodyBuilder.cs b/src/Oms.Application/Shared/OrderDownstreamCreateOneBodyBuilder.cs
index 501a2a9..89f17ac 100644
--- a/src/Oms.Application/Shared/OrderDownstreamCreateOneBodyBuilder.cs
+++ b/src/Oms.Application/Shared/OrderDownstreamCreateOneBodyBuilder.cs
@@ -201,9 +201,10 @@ public static class OrderDownstreamCreateOneBodyBuilder
             ImHsCode = x.ImHsCode,
             ExHsCode = x.ExHsCode ?? x.HsCode,
             DeclareElement = x.DeclareElement,
-            ProductId = x.ProductId,
-            NonStdProductId = x.NonStdProductId,
-            StdProductId = x.StdProductId,
+            // 始终赋值；空白→null。配合 OrderParcelItemInput 上 JsonIgnore(Never)，请求体固定出现 "xxx": null。
+            ProductId = NullIfWhiteSpace(x.ProductId),
+            NonStdProductId = NullIfWhiteSpace(x.NonStdProductId),
+            StdProductId = NullIfWhiteSpace(x.StdProductId),
             SkuImage = fileStorage?.GetPublicUrl(x.SkuImage) ?? x.SkuImage,
             Category = x.Category,
             Brand = x.Brand,
@@ -220,4 +221,7 @@ public static class OrderDownstreamCreateOneBodyBuilder
             Specifications = x.Specifications,
             Comment = x.Comment
         };
+
+    private static string? NullIfWhiteSpace(string? value) =>
+        string.IsNullOrWhiteSpace(value) ? null : value.Trim();
 }
diff --git a/src/Oms.Domain/WarehouseAggregate/Entities/CSku.cs b/src/Oms.Domain/WarehouseAggregate/Entities/CSku.cs
index 7c7559b..1124b02 100644
--- a/src/Oms.Domain/WarehouseAggregate/Entities/CSku.cs
+++ b/src/Oms.Domain/WarehouseAggregate/Entities/CSku.cs
@@ -27,6 +27,21 @@ public class CSku : OmsAuditedAggregateRoot
     /// </summary>
     public string? DeclareElement { get; set; }
 
+    /// <summary>
+    /// 产品标识编码。
+    /// </summary>
+    public string? ProductId { get; set; }
+
+    /// <summary>
+    /// 非标产品标识编码。
+    /// </summary>
+    public string? NonStdProductId { get; set; }
+
+    /// <summary>
+    /// 标准产品标识编码（如 GTIN / UPC / EAN）。
+    /// </summary>
+    public string? StdProductId { get; set; }
+
     public decimal? WeightG { get; set; }
 
     public decimal? LengthCm { get; set; }
diff --git a/src/Oms.Tests/OrderDownstreamCreateOneBodyBuilderTests.cs b/src/Oms.Tests/OrderDownstreamCreateOneBodyBuilderTests.cs
new file mode 100644
index 0000000..6593b18
--- /dev/null
+++ b/src/Oms.Tests/OrderDownstreamCreateOneBodyBuilderTests.cs
@@ -0,0 +1,67 @@
+using System.Text.Json;
+using System.Text.Json.Serialization;
+using FluentAssertions;
+using Moq;
+using Oms.Application.Shared;
+using Oms.Domain.ChannelsAggregate.Repositories;
+using Oms.Domain.OrdersAggregate.Entities;
+using Oms.Domain.SystemAggregate.Repositories;
+
+namespace Oms.Tests;
+
+public class OrderDownstreamCreateOneBodyBuilderTests
+{
+    [Fact]
+    public async Task BuildAsync_ShouldAlwaysSerializeProductIdFieldsIncludingNull()
+    {
+        var order = new Order
+        {
+            Id = 1,
+            ClientNo = "C1",
+            ServiceNo = "S1",
+            ChannelCode = "CH1",
+            ChannelForecastCode = "FC1",
+        };
+        var declarations = new List<OrderDeclaration>
+        {
+            new()
+            {
+                OrderId = 1,
+                CnName = "衬衫",
+                EnName = "Shirt",
+                UnitPrice = 1,
+                Quantity = 1,
+                ProductId = "P-1",
+                NonStdProductId = "   ",
+                StdProductId = " 06901234567890 ",
+            },
+        };
+
+        var body = await OrderDownstreamCreateOneBodyBuilder.BuildAsync(
+            order,
+            sender: null,
+            recipient: null,
+            declarations,
+            weights: [],
+            new Mock<ICountryRepository>(MockBehavior.Loose).Object,
+            new Mock<IServiceChannelRepository>(MockBehavior.Loose).Object);
+
+        body.Items.Should().ContainSingle();
+        body.Items[0].ProductId.Should().Be("P-1");
+        body.Items[0].NonStdProductId.Should().BeNull();
+        body.Items[0].StdProductId.Should().Be("06901234567890");
+
+        // 与 ItfxForwardClient 一致：全局 WhenWritingNull，但三字段 JsonIgnore(Never) 仍写出 null
+        var json = JsonSerializer.Serialize(
+            body,
+            new JsonSerializerOptions
+            {
+                PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
+                DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull,
+            });
+
+        json.Should().Contain("\"productId\":\"P-1\"");
+        json.Should().Contain("\"nonStdProductId\":null");
+        json.Should().Contain("\"stdProductId\":\"06901234567890\"");
+    }
+}