diff --git a/src/Oms.Application/Messaging/OmsIntegrationEventPublisher.cs b/src/Oms.Application/Messaging/OmsIntegrationEventPublisher.cs
index 0f12f49..956bc1e 100644
--- a/src/Oms.Application/Messaging/OmsIntegrationEventPublisher.cs
+++ b/src/Oms.Application/Messaging/OmsIntegrationEventPublisher.cs
@@ -1,3 +1,4 @@
+using System.Data;
 using Fake.EntityFrameworkCore;
 using Fake.EventBus.Distributed;
 using Fake.EventBus.IntegrationEventLog;
@@ -9,6 +10,7 @@ namespace Oms.Application.Messaging;
 
 /// <summary>
 /// 可靠发布 IntegrationEvent：事务 UoW 内写入 Outbox（由 Fake.EventBus.IntegrationEventLog 投递）。
+/// SqlSugar 与 EF 默认各持连接；若环境事务已由 SqlSugar 占用，则改用 RequiresNew 短事务只写 Outbox。
 /// </summary>
 internal static class OmsIntegrationEventPublisher
 {
@@ -21,24 +23,41 @@ internal static class OmsIntegrationEventPublisher
     {
         if (OmsOutboxUnitOfWork.IsAmbientTransactional(unitOfWorkManager))
         {
-            await eventBus.PublishAsync(@event, cancellationToken);
-            logger.LogDebug(
-                "Outbox enqueued {EventName} Id={EventId} (ambient TX)",
+            try
+            {
+                await EnsureOutboxDbContextAsync(unitOfWorkManager);
+                await eventBus.PublishAsync(@event, cancellationToken);
+                logger.LogDebug(
+                    "Outbox enqueued {EventName} Id={EventId} (ambient TX)",
+                    @event.GetType().Name,
+                    @event.Id);
+                return;
+            }
+            catch (Exception ex) when (IsTxConnectionMismatch(ex))
+            {
+                // SqlSugar 已在另一条连接上开事务时，EF 无法征用该 DbTransaction。
+                logger.LogWarning(
+                    ex,
+                    "Ambient UoW TX incompatible with EF Outbox; using short outbox TX. Event={EventName} Id={EventId}",
+                    @event.GetType().Name,
+                    @event.Id);
+            }
+        }
+        else
+        {
+            logger.LogWarning(
+                "Publish {EventName} Id={EventId} without ambient transactional UoW; opening short outbox TX",
                 @event.GetType().Name,
                 @event.Id);
-            return;
         }
 
-        // 无环境事务时开启短事务只写 Outbox，并告警：业务落库与事件非原子。
-        logger.LogWarning(
-            "Publish {EventName} Id={EventId} without ambient transactional UoW; opening short outbox TX",
-            @event.GetType().Name,
-            @event.Id);
-
-        using var uow = unitOfWorkManager.Begin(OmsOutboxUnitOfWork.Transactional());
-        // 先打开 Outbox DbContext 以产生可征用的 DbTransaction
-        var dbProvider = uow.ServiceProvider.GetRequiredService<IEfDbContextProvider<IntegrationEventLogContext>>();
-        await dbProvider.GetDbContextAsync();
+        using var uow = unitOfWorkManager.Begin(new UnitOfWorkAttribute
+        {
+            IsTransactional = true,
+            RequiresNew = true,
+            IsolationLevel = IsolationLevel.ReadCommitted
+        });
+        await EnsureOutboxDbContextAsync(unitOfWorkManager);
         await eventBus.PublishAsync(@event, cancellationToken);
         await uow.CompleteAsync(cancellationToken);
     }
@@ -65,4 +84,30 @@ internal static class OmsIntegrationEventPublisher
             return false;
         }
     }
+
+    /// <summary>
+    /// 业务写库前先打开 Outbox DbContext，尽量让 EF 先占住环境事务连接，供 SqlSugar 征用。
+    /// </summary>
+    public static Task EnsureOutboxDbContextAsync(IUnitOfWorkManager unitOfWorkManager)
+    {
+        var current = unitOfWorkManager.Current
+            ?? throw new InvalidOperationException("No ambient unit of work");
+        var dbProvider = current.ServiceProvider
+            .GetRequiredService<IEfDbContextProvider<IntegrationEventLogContext>>();
+        return dbProvider.GetDbContextAsync();
+    }
+
+    private static bool IsTxConnectionMismatch(Exception ex)
+    {
+        for (var e = ex; e != null; e = e.InnerException!)
+        {
+            if (e.Message.Contains("not associated with the current connection", StringComparison.OrdinalIgnoreCase)
+                || e.Message.Contains("associated with the current connection", StringComparison.OrdinalIgnoreCase))
+            {
+                return true;
+            }
+        }
+
+        return false;
+    }
 }
diff --git a/src/Oms.Application/Services/Orders/Batch/OrderBatchJobCoordinator.cs b/src/Oms.Application/Services/Orders/Batch/OrderBatchJobCoordinator.cs
index b73fa91..3cac21b 100644
--- a/src/Oms.Application/Services/Orders/Batch/OrderBatchJobCoordinator.cs
+++ b/src/Oms.Application/Services/Orders/Batch/OrderBatchJobCoordinator.cs
@@ -1,5 +1,6 @@
 using Fake.Application;
 using Fake.DependencyInjection;
+using Fake.UnitOfWork;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
 using Newtonsoft.Json;
@@ -30,6 +31,7 @@ public sealed class OrderBatchJobCoordinator(
     IObjectStorage fileStorage,
     IOrderBatchJobPublisher publisher,
     OrderBatchJobProcessor batchJobProcessor,
+    IUnitOfWorkManager unitOfWorkManager,
     IOptions<OrderBatchRabbitMqOptions> batchOptions,
     ILogger<OrderBatchJobCoordinator> logger) : IScopedDependency
 {
@@ -76,6 +78,12 @@ public sealed class OrderBatchJobCoordinator(
             }
         }
 
+        // 先打开 EF Outbox 上下文，尽量让环境事务由 EF 占连接，避免 SqlSugar 先开事务后 Outbox 征用失败。
+        if (OmsOutboxUnitOfWork.IsAmbientTransactional(unitOfWorkManager))
+        {
+            await OmsIntegrationEventPublisher.EnsureOutboxDbContextAsync(unitOfWorkManager);
+        }
+
         var now = DateTime.Now;
         var job = new OrderBatchJob
         {
diff --git a/src/Oms.Application/Services/Orders/OrderService.BatchJob.cs b/src/Oms.Application/Services/Orders/OrderService.BatchJob.cs
index 13dafbf..a467162 100644
--- a/src/Oms.Application/Services/Orders/OrderService.BatchJob.cs
+++ b/src/Oms.Application/Services/Orders/OrderService.BatchJob.cs
@@ -1,3 +1,4 @@
+using System.Data;
 using Fake.Application;
 using Fake.Security.Claims;
 using Fake.UnitOfWork;
@@ -22,7 +23,7 @@ public partial class OrderService
     /// 创建订单批量异步任务并入队 RabbitMQ。
     /// </summary>
     [HttpPost("/order/batch/jobs")]
-    [UnitOfWork(IsTransactional = true)]
+    [UnitOfWork(IsTransactional = true, IsolationLevel = IsolationLevel.ReadCommitted)]
     public Task<OrderBatchJobOutput> CreateBatchJobAsync([FromBody] OrderBatchJobCreateInput input)
     {
         return BatchJobCoordinator.CreateAndEnqueueAsync(input, CurrentUser.GetId<int>());
@@ -75,7 +76,7 @@ public partial class OrderService
     /// 异步批量创建轨迹订单（替代前端逐条调用）。
     /// </summary>
     [HttpPost("/order/batch/track-upsert")]
-    [UnitOfWork(IsTransactional = true)]
+    [UnitOfWork(IsTransactional = true, IsolationLevel = IsolationLevel.ReadCommitted)]
     public Task<OrderBatchJobOutput> BatchTrackUpsertAsync([FromBody] OrderBatchJobCreateInput input)
     {
         input.Action = OrderBatchActionCodes.TrackUpsertSmallBag;
@@ -97,7 +98,7 @@ public partial class OrderService
     /// 异步批量预报下游订单。
     /// </summary>
     [HttpPost("/order/batch/downstream-forward")]
-    [UnitOfWork(IsTransactional = true)]
+    [UnitOfWork(IsTransactional = true, IsolationLevel = IsolationLevel.ReadCommitted)]
     public Task<OrderBatchJobOutput> BatchDownstreamForwardAsync([FromBody] OrderBatchJobCreateInput input)
     {
         input.Action = OrderBatchActionCodes.DownstreamForwardCreateOne;
@@ -115,7 +116,7 @@ public partial class OrderService
             string.IsNullOrWhiteSpace(authorization) ? null : authorization);
     }
 
-    [UnitOfWork(IsTransactional = true)]
+    [UnitOfWork(IsTransactional = true, IsolationLevel = IsolationLevel.ReadCommitted)]
     private Task<OrderBatchJobOutput> EnqueueOrderBatchAsync(string action, OrderBatchJobCreateInput input)
     {
         input.Action = action;
@@ -126,7 +127,7 @@ public partial class OrderService
     /// 异步批量支付订单。
     /// </summary>
     [HttpPost("/order/batch/pay")]
-    [UnitOfWork(IsTransactional = true)]
+    [UnitOfWork(IsTransactional = true, IsolationLevel = IsolationLevel.ReadCommitted)]
     public Task<OrderBatchJobOutput> BatchPayAsync([FromBody] OrderBatchJobCreateInput input) =>
         EnqueueOrderBatchAsync(OrderBatchActionCodes.Pay, input);
 
@@ -134,7 +135,7 @@ public partial class OrderService
     /// 异步批量预报订单。
     /// </summary>
     [HttpPost("/order/batch/pre-declare")]
-    [UnitOfWork(IsTransactional = true)]
+    [UnitOfWork(IsTransactional = true, IsolationLevel = IsolationLevel.ReadCommitted)]
     public Task<OrderBatchJobOutput> BatchPreDeclareAsync([FromBody] OrderBatchJobCreateInput input) =>
         EnqueueOrderBatchAsync(OrderBatchActionCodes.PreDeclare, input);
 
@@ -142,7 +143,7 @@ public partial class OrderService
     /// 异步批量拦截订单。
     /// </summary>
     [HttpPost("/order/batch/intercept")]
-    [UnitOfWork(IsTransactional = true)]
+    [UnitOfWork(IsTransactional = true, IsolationLevel = IsolationLevel.ReadCommitted)]
     public Task<OrderBatchJobOutput> BatchInterceptAsync([FromBody] OrderBatchJobCreateInput input) =>
         EnqueueOrderBatchAsync(OrderBatchActionCodes.Intercept, input);
 
@@ -150,7 +151,7 @@ public partial class OrderService
     /// 异步批量取消拦截。
     /// </summary>
     [HttpPost("/order/batch/cancel-intercept")]
-    [UnitOfWork(IsTransactional = true)]
+    [UnitOfWork(IsTransactional = true, IsolationLevel = IsolationLevel.ReadCommitted)]
     public Task<OrderBatchJobOutput> BatchCancelInterceptAsync([FromBody] OrderBatchJobCreateInput input) =>
         EnqueueOrderBatchAsync(OrderBatchActionCodes.CancelIntercept, input);
 
@@ -158,7 +159,7 @@ public partial class OrderService
     /// 异步批量删除订单。
     /// </summary>
     [HttpPost("/order/batch/delete")]
-    [UnitOfWork(IsTransactional = true)]
+    [UnitOfWork(IsTransactional = true, IsolationLevel = IsolationLevel.ReadCommitted)]
     public Task<OrderBatchJobOutput> BatchDeleteAsync([FromBody] OrderBatchJobCreateInput input) =>
         EnqueueOrderBatchAsync(OrderBatchActionCodes.Delete, input);
 
@@ -166,7 +167,7 @@ public partial class OrderService
     /// 异步批量打印面单。
     /// </summary>
     [HttpPost("/order/batch/print")]
-    [UnitOfWork(IsTransactional = true)]
+    [UnitOfWork(IsTransactional = true, IsolationLevel = IsolationLevel.ReadCommitted)]
     public Task<OrderBatchJobOutput> BatchPrintAsync([FromBody] OrderBatchJobCreateInput input) =>
         EnqueueOrderBatchAsync(OrderBatchActionCodes.Print, input);
 
@@ -174,7 +175,7 @@ public partial class OrderService
     /// 异步批量标记问题件。
     /// </summary>
     [HttpPost("/order/batch/mark-problematic")]
-    [UnitOfWork(IsTransactional = true)]
+    [UnitOfWork(IsTransactional = true, IsolationLevel = IsolationLevel.ReadCommitted)]
     public Task<OrderBatchJobOutput> BatchMarkProblematicAsync([FromBody] OrderBatchJobCreateInput input) =>
         EnqueueOrderBatchAsync(OrderBatchActionCodes.MarkProblematic, input);
 
@@ -182,7 +183,7 @@ public partial class OrderService
     /// 异步批量重新排货。
     /// </summary>
     [HttpPost("/order/batch/reallocate")]
-    [UnitOfWork(IsTransactional = true)]
+    [UnitOfWork(IsTransactional = true, IsolationLevel = IsolationLevel.ReadCommitted)]
     public Task<OrderBatchJobOutput> BatchReallocateAsync([FromBody] OrderBatchJobCreateInput input) =>
         EnqueueOrderBatchAsync(OrderBatchActionCodes.Reallocate, input);
 
@@ -190,7 +191,7 @@ public partial class OrderService
     /// 异步批量标记已认领。
     /// </summary>
     [HttpPost("/order/batch/mark-claimed")]
-    [UnitOfWork(IsTransactional = true)]
+    [UnitOfWork(IsTransactional = true, IsolationLevel = IsolationLevel.ReadCommitted)]
     public Task<OrderBatchJobOutput> BatchMarkClaimedAsync([FromBody] OrderBatchJobCreateInput input) =>
         EnqueueOrderBatchAsync(OrderBatchActionCodes.MarkClaimed, input);
 
@@ -198,7 +199,7 @@ public partial class OrderService
     /// 异步批量更新处理状态。
     /// </summary>
     [HttpPost("/order/batch/handle-status-update")]
-    [UnitOfWork(IsTransactional = true)]
+    [UnitOfWork(IsTransactional = true, IsolationLevel = IsolationLevel.ReadCommitted)]
     public Task<OrderBatchJobOutput> BatchHandleStatusUpdateAsync([FromBody] OrderBatchJobCreateInput input) =>
         EnqueueOrderBatchAsync(OrderBatchActionCodes.HandleStatusUpdate, input);
 
diff --git a/src/Oms.Tests/OrderBatchJobCoordinatorGovernanceTests.cs b/src/Oms.Tests/OrderBatchJobCoordinatorGovernanceTests.cs
index 37ecb2f..c48e471 100644
--- a/src/Oms.Tests/OrderBatchJobCoordinatorGovernanceTests.cs
+++ b/src/Oms.Tests/OrderBatchJobCoordinatorGovernanceTests.cs
@@ -1,6 +1,7 @@
 using FluentAssertions;
 using Fake.Application;
 using Fake.ObjectStorage;
+using Fake.UnitOfWork;
 using Microsoft.Extensions.Logging.Abstractions;
 using Microsoft.Extensions.Options;
 using Moq;
@@ -36,6 +37,8 @@ public class OrderBatchJobCoordinatorGovernanceTests
             actionExecutor.Object,
             batchOptions,
             NullLogger<OrderBatchJobProcessor>.Instance);
+        var unitOfWorkManager = new Mock<IUnitOfWorkManager>(MockBehavior.Loose);
+        unitOfWorkManager.SetupGet(x => x.Current).Returns((IUnitOfWork?)null);
         _coordinator = new OrderBatchJobCoordinator(
             _batchJobRepository.Object,
             _orderRepository.Object,
@@ -44,6 +47,7 @@ public class OrderBatchJobCoordinatorGovernanceTests
             _fileStorage.Object,
             _publisher.Object,
             processor,
+            unitOfWorkManager.Object,
             batchOptions,
             NullLogger<OrderBatchJobCoordinator>.Instance);
     }