diff --git a/src/Oms.Application/Services/Orders/OrderService.ParcelBilling.cs b/src/Oms.Application/Services/Orders/OrderService.ParcelBilling.cs
index 5ca83a0..b64264e 100644
--- a/src/Oms.Application/Services/Orders/OrderService.ParcelBilling.cs
+++ b/src/Oms.Application/Services/Orders/OrderService.ParcelBilling.cs
@@ -88,6 +88,7 @@ public partial class OrderService
 
             var zoneKeys = await ResolvePriceZoneKeysAsync(
                 product,
+                snapshotBinding.Rules,
                 country.CountryCode,
                 input.Receiver?.Province,
                 input.Receiver?.City,
@@ -408,31 +409,55 @@ public partial class OrderService
             zipCode));
     }
 
+    private static int? ResolveEffectivePriceAreaId(
+        SalesProduct product,
+        SalesProductRulesPublishSnapshotDto? rulesSnapshot)
+    {
+        if (product.PriceAreaId is > 0)
+        {
+            return product.PriceAreaId;
+        }
+
+        if (rulesSnapshot?.Product?.PriceAreaId is > 0)
+        {
+            return rulesSnapshot.Product.PriceAreaId;
+        }
+
+        return null;
+    }
+
     private async Task<IReadOnlyList<string>?> ResolvePriceZoneKeysAsync(
         SalesProduct product,
+        SalesProductRulesPublishSnapshotDto? rulesSnapshot,
         string countryCode,
         string? province,
         string? city,
         string? zipCode)
     {
-        if (!product.PriceAreaId.HasValue || product.PriceAreaId <= 0)
+        var priceAreaId = ResolveEffectivePriceAreaId(product, rulesSnapshot);
+        if (!priceAreaId.HasValue)
         {
-            return new[] { "默认分区" };
+            return null;
         }
 
-        var area = await KpiAreaRepository.FirstOrDefaultAsync(x => x.Id == product.PriceAreaId.Value);
+        var area = await KpiAreaRepository.FirstOrDefaultAsync(x => x.Id == priceAreaId.Value);
         if (area == null)
         {
             return null;
         }
 
-        var rules = await KpiAreaRepository.GetAllInfosByAreaIdAsync(product.PriceAreaId.Value);
+        var rules = await KpiAreaRepository.GetAllInfosByAreaIdAsync(priceAreaId.Value);
         var matched = rules.FirstOrDefault(rule => ParcelBillingCalculator.IsAreaMatched(
             rule,
             countryCode,
             province,
             city,
             zipCode));
+        if (matched == null)
+        {
+            return null;
+        }
+
         var keys = ParcelBillingCalculator.BuildPriceZoneKeys(matched, area);
         return keys.Count > 0 ? keys : null;
     }
diff --git a/src/Oms.Application/Services/Orders/OrderService.ParcelQuote.cs b/src/Oms.Application/Services/Orders/OrderService.ParcelQuote.cs
index 53c5255..918e17b 100644
--- a/src/Oms.Application/Services/Orders/OrderService.ParcelQuote.cs
+++ b/src/Oms.Application/Services/Orders/OrderService.ParcelQuote.cs
@@ -217,8 +217,18 @@ public partial class OrderService
             return PriceCheckFailure(product, "weight", ex.Message);
         }
 
+        var priceAreaId = ResolveEffectivePriceAreaId(product, snapshotBinding.Rules);
+        if (!priceAreaId.HasValue)
+        {
+            return PriceCheckFailure(
+                product,
+                "zone",
+                "产品未配置价格分区(PriceAreaId)，无法根据国家+邮编匹配卖价明细中的分区键");
+        }
+
         var zoneKeys = await ResolvePriceZoneKeysAsync(
             product,
+            snapshotBinding.Rules,
             context.CountryCode,
             context.Province,
             context.City,
@@ -228,7 +238,8 @@ public partial class OrderService
             return PriceCheckFailure(
                 product,
                 "zone",
-                $"目的国 {context.CountryCode} 邮编 {FormatPostalCode(context.PostalCode)} 未匹配产品价格分区（请检查 PriceAreaId 及分区规则）");
+                $"目的国 {context.CountryCode} 邮编 {FormatPostalCode(context.PostalCode)} 未命中价格分区规则(PriceAreaId={priceAreaId})，" +
+                $"卖价明细分区键(如 3) 无法解析，请检查 t_kpi_area_info 国家/邮编配置");
         }
 
         var chargeableWeight = forecast.ChargeableWeight ?? 0;
diff --git a/src/Oms.Tests/PriceCheckSnapshotVerificationTests.cs b/src/Oms.Tests/PriceCheckSnapshotVerificationTests.cs
index 5409de9..357432e 100644
--- a/src/Oms.Tests/PriceCheckSnapshotVerificationTests.cs
+++ b/src/Oms.Tests/PriceCheckSnapshotVerificationTests.cs
@@ -73,6 +73,57 @@ public class PriceCheckSnapshotVerificationTests
         ParcelBillingCalculator.WeightInLeftOpenRightClosedInterval(0M, start, end).Should().BeFalse();
     }
 
+    [Fact]
+    public void TryParseWeightInterval_IntervalNotation_ShouldParseLeftOpenRightClosed()
+    {
+        ParcelBillingCalculator.TryParseWeightInterval("(0-0.5]", out var start, out var end).Should().BeTrue();
+        start.Should().Be(0);
+        end.Should().Be(0.5M);
+        ParcelBillingCalculator.WeightInLeftOpenRightClosedInterval(0.5M, start, end).Should().BeTrue();
+    }
+
+    [Fact]
+    public void UserSnapshot_IntervalWeightFormat_Zone3_Weight05_ShouldMatchFreight11AndHandling20()
+    {
+        var snapshot = new SalesProductPricePublishSnapshotDto
+        {
+            SalesProductId = 1,
+            Prices =
+            [
+                new SalesProductPriceListOutput
+                {
+                    Id = 1,
+                    Status = 1,
+                    CostItem = "freight",
+                    Details =
+                    [
+                        Detail(34, 1, "unit", "3", "(0-0.5]", 11),
+                        Detail(35, 1, "unit", "3", "(0.5-1]", 12),
+                    ]
+                },
+                new SalesProductPriceListOutput
+                {
+                    Id = 2,
+                    Status = 1,
+                    CostItem = "handling",
+                    Details = [Detail(38, 2, "total", "3", "(0-10]", 20)]
+                }
+            ]
+        };
+
+        var fees = ParcelBillingCalculator.CalculateQuoteReceivableFees(
+            snapshot,
+            "PRICE-20260626102033",
+            DateTime.Now,
+            0.5M,
+            ["3"],
+            CargoAttributeCodes.General,
+            CustomerGroup.Normal);
+
+        fees.Should().HaveCount(2);
+        fees.Sum(x => x.Amount).Should().Be(31M);
+    }
+
     [Fact]
     public void UserSnapshot_Zone3_Weight05_ShouldMatchFreight11AndHandling20()
     {