diff --git a/src/Oms.Application/Dtos/Channels/KpiAreaInfoImportInput.cs b/src/Oms.Application/Dtos/Channels/KpiAreaInfoImportInput.cs
new file mode 100644
index 0000000..a2e5388
--- /dev/null
+++ b/src/Oms.Application/Dtos/Channels/KpiAreaInfoImportInput.cs
@@ -0,0 +1,19 @@
+using Microsoft.AspNetCore.Http;
+
+namespace Oms.Application.Dtos.Channels;
+
+/// <summary>
+/// KPI 分区明细 Excel 导入入参。
+/// </summary>
+public class KpiAreaInfoImportInput
+{
+    /// <summary>
+    /// 分区主键。
+    /// </summary>
+    public int AreaId { get; set; }
+
+    /// <summary>
+    /// Excel 文件。
+    /// </summary>
+    public IFormFile File { get; set; } = null!;
+}
diff --git a/src/Oms.Application/Dtos/Channels/KpiAreaInfoImportOutput.cs b/src/Oms.Application/Dtos/Channels/KpiAreaInfoImportOutput.cs
new file mode 100644
index 0000000..5927568
--- /dev/null
+++ b/src/Oms.Application/Dtos/Channels/KpiAreaInfoImportOutput.cs
@@ -0,0 +1,23 @@
+namespace Oms.Application.Dtos.Channels;
+
+/// <summary>
+/// KPI 分区明细 Excel 导入结果。
+/// </summary>
+public class KpiAreaInfoImportOutput
+{
+    public int SuccessCount { get; set; }
+
+    public int FailCount { get; set; }
+
+    public List<KpiAreaInfoImportFailRow> Failures { get; set; } = [];
+}
+
+/// <summary>
+/// 导入失败行。
+/// </summary>
+public class KpiAreaInfoImportFailRow
+{
+    public int RowNumber { get; set; }
+
+    public string Reason { get; set; } = string.Empty;
+}
diff --git a/src/Oms.Application/Dtos/Orders/PublishSnapshotRuleDtos.cs b/src/Oms.Application/Dtos/Orders/PublishSnapshotRuleDtos.cs
index 9321cfe..c28a384 100644
--- a/src/Oms.Application/Dtos/Orders/PublishSnapshotRuleDtos.cs
+++ b/src/Oms.Application/Dtos/Orders/PublishSnapshotRuleDtos.cs
@@ -55,6 +55,14 @@ public class WeightRoundingSnapshotRangeDto
     public decimal End { get; set; }
 
     public string? Public { get; set; }
+
+    /// <summary>旧快照/明细 API 兼容（t_weight_rounding_info.StartValue）；读取后由 <see cref="PublishSnapshotNormalizer"/> 合并至 <see cref="Start"/>。</summary>
+    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
+    public decimal StartValue { get; set; }
+
+    /// <summary>旧快照/明细 API 兼容（t_weight_rounding_info.EndValue）；读取后由 <see cref="PublishSnapshotNormalizer"/> 合并至 <see cref="End"/>。</summary>
+    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
+    public decimal EndValue { get; set; }
 }
 
 /// <summary>
diff --git a/src/Oms.Application/Services/Channels/KpiAreaService.cs b/src/Oms.Application/Services/Channels/KpiAreaService.cs
index 5138bc8..f391563 100644
--- a/src/Oms.Application/Services/Channels/KpiAreaService.cs
+++ b/src/Oms.Application/Services/Channels/KpiAreaService.cs
@@ -1,11 +1,13 @@
 using System.Linq.Expressions;
 using Fake.Application;
+using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Mvc;
 using Oms.Application.Dtos.Channels;
 using Oms.Application.Dtos.Shared;
 using Oms.Application.Shared;
 using Oms.Domain.ChannelsAggregate.Entities;
 using Oms.Domain.ChannelsAggregate.Repositories;
+using Oms.Domain.SystemAggregate.Repositories;
 
 namespace Oms.Application.Services.Channels;
 
@@ -17,6 +19,8 @@ public class KpiAreaService : ApplicationService
 {
     private IKpiAreaRepository KpiAreaRepository => LazyServiceProvider.GetRequiredService<IKpiAreaRepository>();
 
+    private ICountryRepository CountryRepository => LazyServiceProvider.GetRequiredService<ICountryRepository>();
+
     /// <summary>
     /// 查询KPI分区列表。
     /// </summary>
@@ -210,6 +214,69 @@ public class KpiAreaService : ApplicationService
         await KpiAreaRepository.DeleteInfoAsync(input.Id);
     }
 
+    /// <summary>
+    /// 下载 KPI 分区明细导入模板。
+    /// </summary>
+    [HttpGet("/channel/kpi-area/info/import-template")]
+    public async Task<FileContentResult> DownloadInfoImportTemplateAsync([FromQuery] string? areaType)
+    {
+        var bytes = await KpiAreaInfoImportHelper.BuildTemplateBytesAsync();
+        return new FileContentResult(bytes, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet")
+        {
+            FileDownloadName = KpiAreaInfoImportHelper.ResolveTemplateFileName(areaType)
+        };
+    }
+
+    /// <summary>
+    /// 导入 KPI 分区明细（Excel）。
+    /// </summary>
+    [HttpPost("/channel/kpi-area/info/import")]
+    public async Task<KpiAreaInfoImportOutput> ImportInfoAsync([FromForm] KpiAreaInfoImportInput input)
+    {
+        if (input.File == null || input.File.Length == 0)
+        {
+            throw new BusinessException("请上传 Excel 文件");
+        }
+
+        await GetAreaOrThrowAsync(input.AreaId);
+
+        await using var stream = input.File.OpenReadStream();
+        var parsedRows = await KpiAreaInfoImportHelper.ParseImportRowsAsync(stream);
+        if (parsedRows.Count == 0)
+        {
+            throw new BusinessException("Excel 中无有效数据行");
+        }
+
+        var countries = await CountryRepository.GetListAsync();
+        var countriesByCode = countries
+            .Where(x => !string.IsNullOrWhiteSpace(x.CountryCode))
+            .GroupBy(x => x.CountryCode.Trim(), StringComparer.OrdinalIgnoreCase)
+            .ToDictionary(g => g.Key, g => g.First(), StringComparer.OrdinalIgnoreCase);
+
+        var output = new KpiAreaInfoImportOutput();
+        foreach (var (rowNumber, entity) in parsedRows)
+        {
+            try
+            {
+                KpiAreaInfoImportHelper.PrepareEntityForImport(entity, countriesByCode);
+                entity.AreaId = input.AreaId;
+                await KpiAreaRepository.InsertInfoAsync(entity);
+                output.SuccessCount++;
+            }
+            catch (Exception ex)
+            {
+                output.FailCount++;
+                output.Failures.Add(new KpiAreaInfoImportFailRow
+                {
+                    RowNumber = rowNumber,
+                    Reason = ex.Message
+                });
+            }
+        }
+
+        return output;
+    }
+
     private static Expression<Func<KpiArea, bool>> BuildAreaPredicate(KpiAreaListInput input)
     {
         var appKey = input.AppKey?.Trim();
diff --git a/src/Oms.Application/Services/Orders/OrderService.ParcelBilling.cs b/src/Oms.Application/Services/Orders/OrderService.ParcelBilling.cs
index 7b21faa..4ee7d7e 100644
--- a/src/Oms.Application/Services/Orders/OrderService.ParcelBilling.cs
+++ b/src/Oms.Application/Services/Orders/OrderService.ParcelBilling.cs
@@ -597,10 +597,13 @@ public partial class OrderService
                 throw new BusinessException("未配置计重进位");
             }
 
+            var snapshotRanges = rulesSnapshot?.WeightRoundingInfos;
+            var fromSnapshot = snapshotRanges is { Count: > 0 }
+                               && snapshotRanges.Any(x => !string.IsNullOrWhiteSpace(x.Public));
             IReadOnlyList<WeightRoundingInfo> ranges;
-            if (rulesSnapshot?.WeightRoundingInfos is { Count: > 0 })
+            if (fromSnapshot)
             {
-                ranges = RulesSnapshotHelper.ToWeightRoundingEntities(rulesSnapshot.WeightRoundingInfos);
+                ranges = RulesSnapshotHelper.ToWeightRoundingEntities(snapshotRanges!);
             }
             else
             {
@@ -613,7 +616,20 @@ public partial class OrderService
                 ranges = await WeightRoundingRepository.GetAllInfosByRoundingIdAsync(weightRoundingId.Value);
             }
 
-            forecast.ChargeableWeight = ParcelBillingCalculator.ApplyRounding(rawWeight, ranges);
+            try
+            {
+                forecast.ChargeableWeight = ParcelBillingCalculator.ApplyRounding(rawWeight, ranges);
+            }
+            catch (InvalidOperationException) when (fromSnapshot)
+            {
+                var dbRanges = await WeightRoundingRepository.GetAllInfosByRoundingIdAsync(weightRoundingId.Value);
+                if (dbRanges.Count == 0)
+                {
+                    throw;
+                }
+
+                forecast.ChargeableWeight = ParcelBillingCalculator.ApplyRounding(rawWeight, dbRanges);
+            }
         }
         catch (BusinessException)
         {
diff --git a/src/Oms.Application/Shared/KpiAreaInfoImportHelper.cs b/src/Oms.Application/Shared/KpiAreaInfoImportHelper.cs
new file mode 100644
index 0000000..7377412
--- /dev/null
+++ b/src/Oms.Application/Shared/KpiAreaInfoImportHelper.cs
@@ -0,0 +1,230 @@
+using System.Text.RegularExpressions;
+using MiniExcelLibs;
+using Oms.Application.Dtos.Channels;
+using Oms.Domain.ChannelsAggregate.Entities;
+using Oms.Domain.SystemAggregate.Entities;
+
+namespace Oms.Application.Shared;
+
+/// <summary>
+/// KPI 分区明细 Excel 模板与导入解析。
+/// </summary>
+public static class KpiAreaInfoImportHelper
+{
+    private static readonly Regex ChinesePattern = new(@"[\u4E00-\u9FA5]", RegexOptions.Compiled);
+
+    private static readonly Dictionary<string, string> HeaderAliases = new(StringComparer.OrdinalIgnoreCase)
+    {
+        ["国家代码"] = nameof(KpiAreaInfo.CountryCode),
+        ["CountryCode"] = nameof(KpiAreaInfo.CountryCode),
+        ["countryCode"] = nameof(KpiAreaInfo.CountryCode),
+        ["国家名称"] = nameof(KpiAreaInfo.CountryName),
+        ["CountryName"] = nameof(KpiAreaInfo.CountryName),
+        ["countryName"] = nameof(KpiAreaInfo.CountryName),
+        ["州/省"] = nameof(KpiAreaInfo.Province),
+        ["州省"] = nameof(KpiAreaInfo.Province),
+        ["Province"] = nameof(KpiAreaInfo.Province),
+        ["province"] = nameof(KpiAreaInfo.Province),
+        ["城市"] = nameof(KpiAreaInfo.City),
+        ["City"] = nameof(KpiAreaInfo.City),
+        ["city"] = nameof(KpiAreaInfo.City),
+        ["起始邮编"] = nameof(KpiAreaInfo.LeftPostcode),
+        ["LeftPostcode"] = nameof(KpiAreaInfo.LeftPostcode),
+        ["leftPostcode"] = nameof(KpiAreaInfo.LeftPostcode),
+        ["leftPostCode"] = nameof(KpiAreaInfo.LeftPostcode),
+        ["截止邮编"] = nameof(KpiAreaInfo.RightPostcode),
+        ["RightPostcode"] = nameof(KpiAreaInfo.RightPostcode),
+        ["rightPostcode"] = nameof(KpiAreaInfo.RightPostcode),
+        ["rightPostCode"] = nameof(KpiAreaInfo.RightPostcode),
+    };
+
+    public static async Task<byte[]> BuildTemplateBytesAsync()
+    {
+        var rows = new List<Dictionary<string, object?>>
+        {
+            new()
+            {
+                ["国家代码"] = "US",
+                ["国家名称"] = "美国",
+                ["州/省"] = "CA",
+                ["城市"] = "",
+                ["起始邮编"] = "90000",
+                ["截止邮编"] = "90199"
+            }
+        };
+
+        await using var stream = new MemoryStream();
+        await MiniExcel.SaveAsAsync(stream, rows);
+        return stream.ToArray();
+    }
+
+    public static string ResolveTemplateFileName(string? areaType) =>
+        areaType?.Trim().ToLowerInvariant() switch
+        {
+            "blacklist" => "黑名单分区明细导入模板.xlsx",
+            "remote" => "偏远分区明细导入模板.xlsx",
+            "price" => "价格分区明细导入模板.xlsx",
+            _ => "分区明细导入模板.xlsx"
+        };
+
+    public static async Task<List<(int RowNumber, KpiAreaInfo Entity)>> ParseImportRowsAsync(Stream fileStream)
+    {
+        var rows = await MiniExcel.QueryAsync(fileStream, useHeaderRow: true);
+        var result = new List<(int RowNumber, KpiAreaInfo Entity)>();
+        var rowNumber = 1;
+
+        foreach (var row in rows)
+        {
+            rowNumber++;
+            if (row is not IDictionary<string, object> rowDict)
+            {
+                continue;
+            }
+
+            if (IsEmptyRow(rowDict))
+            {
+                continue;
+            }
+
+            result.Add((rowNumber, ParseRow(rowDict)));
+        }
+
+        return result;
+    }
+
+    public static void PrepareEntityForImport(
+        KpiAreaInfo entity,
+        IReadOnlyDictionary<string, Country> countriesByCode)
+    {
+        ValidateEntity(entity);
+
+        if (string.IsNullOrWhiteSpace(entity.CountryName)
+            && !string.IsNullOrWhiteSpace(entity.CountryCode))
+        {
+            var code = entity.CountryCode.Trim();
+            if (countriesByCode.TryGetValue(code, out var country))
+            {
+                entity.CountryName = country.ChineseName;
+            }
+        }
+
+        if (string.IsNullOrWhiteSpace(entity.CountryName))
+        {
+            throw new InvalidOperationException("国家名称不能为空，请填写国家名称或有效的国家代码");
+        }
+    }
+
+    private static KpiAreaInfo ParseRow(IDictionary<string, object> rowDict)
+    {
+        var mapped = new Dictionary<string, string?>(StringComparer.OrdinalIgnoreCase);
+        foreach (var (header, value) in rowDict)
+        {
+            if (!HeaderAliases.TryGetValue(header.Trim(), out var field))
+            {
+                continue;
+            }
+
+            mapped[field] = NormalizeCell(value);
+        }
+
+        return new KpiAreaInfo
+        {
+            CountryCode = mapped.GetValueOrDefault(nameof(KpiAreaInfo.CountryCode)),
+            CountryName = mapped.GetValueOrDefault(nameof(KpiAreaInfo.CountryName)),
+            Province = mapped.GetValueOrDefault(nameof(KpiAreaInfo.Province)),
+            City = mapped.GetValueOrDefault(nameof(KpiAreaInfo.City)),
+            LeftPostcode = mapped.GetValueOrDefault(nameof(KpiAreaInfo.LeftPostcode)),
+            RightPostcode = mapped.GetValueOrDefault(nameof(KpiAreaInfo.RightPostcode))
+        };
+    }
+
+    private static void ValidateEntity(KpiAreaInfo entity)
+    {
+        if (string.IsNullOrWhiteSpace(entity.CountryCode))
+        {
+            throw new InvalidOperationException("国家代码不能为空");
+        }
+
+        entity.CountryCode = entity.CountryCode.Trim();
+        if (entity.CountryCode.Length > 16)
+        {
+            throw new InvalidOperationException("国家代码不可超过16个字符");
+        }
+
+        if (!string.IsNullOrWhiteSpace(entity.CountryName))
+        {
+            entity.CountryName = entity.CountryName.Trim();
+            if (entity.CountryName.Length > 64)
+            {
+                throw new InvalidOperationException("国家名称不可超过64个字符");
+            }
+        }
+
+        entity.Province = TrimOrNull(entity.Province);
+        entity.City = TrimOrNull(entity.City);
+        entity.LeftPostcode = TrimOrNull(entity.LeftPostcode);
+        entity.RightPostcode = TrimOrNull(entity.RightPostcode);
+
+        if (!string.IsNullOrWhiteSpace(entity.Province) && entity.Province.Length > 128)
+        {
+            throw new InvalidOperationException("州/省不可超过128个字符");
+        }
+
+        if (!string.IsNullOrWhiteSpace(entity.City) && entity.City.Length > 128)
+        {
+            throw new InvalidOperationException("城市不可超过128个字符");
+        }
+
+        ValidatePostcode(entity.LeftPostcode, "起始邮编");
+        ValidatePostcode(entity.RightPostcode, "截止邮编");
+
+        var hasLeft = !string.IsNullOrWhiteSpace(entity.LeftPostcode);
+        var hasRight = !string.IsNullOrWhiteSpace(entity.RightPostcode);
+        if (hasLeft != hasRight)
+        {
+            throw new InvalidOperationException("起始邮编与截止邮编需同时填写或同时留空");
+        }
+    }
+
+    private static void ValidatePostcode(string? value, string label)
+    {
+        if (string.IsNullOrWhiteSpace(value))
+        {
+            return;
+        }
+
+        if (ChinesePattern.IsMatch(value))
+        {
+            throw new InvalidOperationException($"{label}不能包含中文");
+        }
+
+        if (value.Length > 30)
+        {
+            throw new InvalidOperationException($"{label}不可超过30个字符");
+        }
+    }
+
+    private static string? TrimOrNull(string? value)
+    {
+        if (string.IsNullOrWhiteSpace(value))
+        {
+            return null;
+        }
+
+        return value.Trim();
+    }
+
+    private static string? NormalizeCell(object? value)
+    {
+        if (value is null)
+        {
+            return null;
+        }
+
+        var text = Convert.ToString(value, System.Globalization.CultureInfo.InvariantCulture)?.Trim();
+        return string.IsNullOrWhiteSpace(text) ? null : text;
+    }
+
+    private static bool IsEmptyRow(IDictionary<string, object> rowDict) =>
+        rowDict.Values.All(value => string.IsNullOrWhiteSpace(NormalizeCell(value)));
+}
diff --git a/src/Oms.Application/Shared/PublishSnapshotNormalizer.cs b/src/Oms.Application/Shared/PublishSnapshotNormalizer.cs
index ac3ff63..0ca3f0b 100644
--- a/src/Oms.Application/Shared/PublishSnapshotNormalizer.cs
+++ b/src/Oms.Application/Shared/PublishSnapshotNormalizer.cs
@@ -16,6 +16,7 @@ public static class PublishSnapshotNormalizer
 
         NormalizeKpiAreas(snapshot.BlacklistAreaInfos);
         NormalizeKpiAreas(snapshot.RemoteAreaInfos);
+        NormalizeWeightRoundingRanges(snapshot.WeightRoundingInfos);
     }
 
     public static void NormalizePriceSnapshot(SalesProductPricePublishSnapshotDto? snapshot)
@@ -47,4 +48,34 @@ public static class PublishSnapshotNormalizer
             area.RightPostcode = null;
         }
     }
+
+    public static void NormalizeWeightRoundingRanges(List<WeightRoundingSnapshotRangeDto>? ranges)
+    {
+        if (ranges is null)
+        {
+            return;
+        }
+
+        foreach (var range in ranges)
+        {
+            if (range.StartValue != 0)
+            {
+                range.Start = range.StartValue;
+            }
+
+            if (range.EndValue != 0)
+            {
+                range.End = range.EndValue;
+            }
+
+            range.StartValue = 0;
+            range.EndValue = 0;
+
+            if (range.Start == 0 && range.End == 0 && !string.IsNullOrWhiteSpace(range.Public))
+            {
+                // 无效区间占位，避免误用导致「计重进位区间未匹配」；后续会降级读 DB。
+                range.Public = null;
+            }
+        }
+    }
 }
diff --git a/src/Oms.Tests/KpiAreaInfoImportHelperTests.cs b/src/Oms.Tests/KpiAreaInfoImportHelperTests.cs
new file mode 100644
index 0000000..1adc5ed
--- /dev/null
+++ b/src/Oms.Tests/KpiAreaInfoImportHelperTests.cs
@@ -0,0 +1,43 @@
+using FluentAssertions;
+using Oms.Application.Shared;
+using Oms.Domain.ChannelsAggregate.Entities;
+using Oms.Domain.SystemAggregate.Entities;
+
+namespace Oms.Tests;
+
+public class KpiAreaInfoImportHelperTests
+{
+    [Fact]
+    public void PrepareEntityForImport_ValidRow_ShouldFillCountryName()
+    {
+        var entity = new KpiAreaInfo
+        {
+            CountryCode = "US",
+            LeftPostcode = "90000",
+            RightPostcode = "90199"
+        };
+        var countries = new Dictionary<string, Country>(StringComparer.OrdinalIgnoreCase)
+        {
+            ["US"] = new Country { CountryCode = "US", ChineseName = "美国" }
+        };
+
+        KpiAreaInfoImportHelper.PrepareEntityForImport(entity, countries);
+
+        entity.CountryName.Should().Be("美国");
+    }
+
+    [Fact]
+    public void PrepareEntityForImport_MissingPostcodePair_ShouldThrow()
+    {
+        var entity = new KpiAreaInfo
+        {
+            CountryCode = "US",
+            CountryName = "美国",
+            LeftPostcode = "90000"
+        };
+
+        var act = () => KpiAreaInfoImportHelper.PrepareEntityForImport(entity, new Dictionary<string, Country>());
+
+        act.Should().Throw<InvalidOperationException>().WithMessage("*截止邮编*");
+    }
+}
diff --git a/src/Oms.Tests/RulesSnapshotVerificationTests.cs b/src/Oms.Tests/RulesSnapshotVerificationTests.cs
index 8ec6e40..78e4f5b 100644
--- a/src/Oms.Tests/RulesSnapshotVerificationTests.cs
+++ b/src/Oms.Tests/RulesSnapshotVerificationTests.cs
@@ -121,4 +121,34 @@ public class RulesSnapshotVerificationTests
         rawWeight.Should().Be(0.5M);
         chargeable.Should().Be(0.5M);
     }
+
+    [Fact]
+    public void DeserializeRulesSnapshot_StartValueEndValue_ShouldApplyRoundingFor12kg()
+    {
+        const string json = """
+            {
+              "WeightRoundingId": 1,
+              "WeightRoundingInfos": [
+                { "Id": 1, "StartValue": 0, "EndValue": 99, "Public": "0.5" }
+              ],
+              "WeightRuleInfos": [
+                { "Id": 1, "VolumetricFactor": "8000", "Condition": "gw>vw", "BillableWeight": "gw" }
+              ]
+            }
+            """;
+
+        var snapshot = OmsDocHelper.DeserializeRulesSnapshot(json);
+        snapshot.Should().NotBeNull();
+        snapshot!.WeightRoundingInfos[0].Start.Should().Be(0);
+        snapshot.WeightRoundingInfos[0].End.Should().Be(99);
+
+        var forecast = new OrderWeight { Length = 10, Width = 10, Height = 10, ActualWeight = 1.2M };
+        var ruleInfos = RulesSnapshotHelper.ToWeightRuleEntities(snapshot.WeightRuleInfos);
+        var (_, rawWeight) = ParcelBillingCalculator.CalculateRawBillableWeight(forecast, ruleInfos);
+        var ranges = RulesSnapshotHelper.ToWeightRoundingEntities(snapshot.WeightRoundingInfos);
+        var chargeable = ParcelBillingCalculator.ApplyRounding(rawWeight, ranges);
+
+        rawWeight.Should().Be(1.2M);
+        chargeable.Should().Be(1.5M);
+    }
 }