diff --git a/modules/EasyAbp.EShop.Orders/src/EasyAbp.EShop.Orders.Domain/EasyAbp/EShop/Orders/Orders/IOrderManager.cs b/modules/EasyAbp.EShop.Orders/src/EasyAbp.EShop.Orders.Domain/EasyAbp/EShop/Orders/Orders/IOrderManager.cs
index 6f4bfc61..2ca6052d 100644
--- a/modules/EasyAbp.EShop.Orders/src/EasyAbp.EShop.Orders.Domain/EasyAbp/EShop/Orders/Orders/IOrderManager.cs
+++ b/modules/EasyAbp.EShop.Orders/src/EasyAbp.EShop.Orders.Domain/EasyAbp/EShop/Orders/Orders/IOrderManager.cs
@@ -8,6 +8,6 @@ namespace EasyAbp.EShop.Orders.Orders
     {
         Task<Order> CompleteAsync(Order order);
         
-        Task<Order> CancelAsync(Order order, string cancellationReason);
+        Task<Order> CancelAsync(Order order, string cancellationReason, bool forceCancel = false);
     }
 }
\ No newline at end of file
diff --git a/modules/EasyAbp.EShop.Orders/src/EasyAbp.EShop.Orders.Domain/EasyAbp/EShop/Orders/Orders/Order.cs b/modules/EasyAbp.EShop.Orders/src/EasyAbp.EShop.Orders.Domain/EasyAbp/EShop/Orders/Orders/Order.cs
index 663c02d0..06fa086c 100644
--- a/modules/EasyAbp.EShop.Orders/src/EasyAbp.EShop.Orders.Domain/EasyAbp/EShop/Orders/Orders/Order.cs
+++ b/modules/EasyAbp.EShop.Orders/src/EasyAbp.EShop.Orders.Domain/EasyAbp/EShop/Orders/Orders/Order.cs
@@ -226,5 +226,11 @@ namespace EasyAbp.EShop.Orders.Orders
         {
             StaffRemark = staffRemark;
         }
+
+        public bool IsInInventoryDeductionStage()
+        {
+            return !ReducedInventoryAfterPlacingTime.HasValue ||
+                   PaidTime.HasValue && !ReducedInventoryAfterPaymentTime.HasValue;
+        }
     }
 }
diff --git a/modules/EasyAbp.EShop.Orders/src/EasyAbp.EShop.Orders.Domain/EasyAbp/EShop/Orders/Orders/OrderManager.cs b/modules/EasyAbp.EShop.Orders/src/EasyAbp.EShop.Orders.Domain/EasyAbp/EShop/Orders/Orders/OrderManager.cs
index 912b968f..a242be5c 100644
--- a/modules/EasyAbp.EShop.Orders/src/EasyAbp.EShop.Orders.Domain/EasyAbp/EShop/Orders/Orders/OrderManager.cs
+++ b/modules/EasyAbp.EShop.Orders/src/EasyAbp.EShop.Orders.Domain/EasyAbp/EShop/Orders/Orders/OrderManager.cs
@@ -57,14 +57,14 @@ namespace EasyAbp.EShop.Orders.Orders
         }
 
         [UnitOfWork]
-        public virtual async Task<Order> CancelAsync(Order order, string cancellationReason)
+        public virtual async Task<Order> CancelAsync(Order order, string cancellationReason, bool forceCancel = false)
         {
             if (order.CanceledTime.HasValue)
             {
                 throw new OrderIsInWrongStageException(order.Id);
             }
             
-            if (order.IsInPayment())
+            if (!forceCancel && (order.IsInPayment() || order.IsInInventoryDeductionStage()))
             {
                 throw new OrderIsInWrongStageException(order.Id);
             }
diff --git a/modules/EasyAbp.EShop.Orders/src/EasyAbp.EShop.Orders.Domain/EasyAbp/EShop/Orders/Orders/PaymentCanceledEventHandler.cs b/modules/EasyAbp.EShop.Orders/src/EasyAbp.EShop.Orders.Domain/EasyAbp/EShop/Orders/Orders/PaymentCanceledEventHandler.cs
index 827ad846..a66c8c69 100644
--- a/modules/EasyAbp.EShop.Orders/src/EasyAbp.EShop.Orders.Domain/EasyAbp/EShop/Orders/Orders/PaymentCanceledEventHandler.cs
+++ b/modules/EasyAbp.EShop.Orders/src/EasyAbp.EShop.Orders.Domain/EasyAbp/EShop/Orders/Orders/PaymentCanceledEventHandler.cs
@@ -40,6 +40,7 @@ namespace EasyAbp.EShop.Orders.Orders
                 
                 order.SetPaymentId(null);
 
+                // OrderAutoCancelOnUpdatedHandler may auto cancel the unpaid order.
                 await _orderRepository.UpdateAsync(order, true);
             }
         }
diff --git a/modules/EasyAbp.EShop.Orders/src/EasyAbp.EShop.Orders.Domain/EasyAbp/EShop/Orders/Orders/ProductInventoryReductionEventHandler.cs b/modules/EasyAbp.EShop.Orders/src/EasyAbp.EShop.Orders.Domain/EasyAbp/EShop/Orders/Orders/ProductInventoryReductionEventHandler.cs
index 2e126164..4098a3bd 100644
--- a/modules/EasyAbp.EShop.Orders/src/EasyAbp.EShop.Orders.Domain/EasyAbp/EShop/Orders/Orders/ProductInventoryReductionEventHandler.cs
+++ b/modules/EasyAbp.EShop.Orders/src/EasyAbp.EShop.Orders.Domain/EasyAbp/EShop/Orders/Orders/ProductInventoryReductionEventHandler.cs
@@ -1,10 +1,7 @@
-using System.Collections.Generic;
-using System.Linq;
+using System.Linq;
 using System.Threading.Tasks;
 using EasyAbp.EShop.Payments.Refunds;
 using EasyAbp.EShop.Products.Products;
-using EasyAbp.PaymentService.Refunds;
-using Volo.Abp.Data;
 using Volo.Abp.DependencyInjection;
 using Volo.Abp.EventBus.Distributed;
 using Volo.Abp.MultiTenancy;
@@ -49,7 +46,8 @@ namespace EasyAbp.EShop.Orders.Orders
 
                 if (!eventData.IsSuccess)
                 {
-                    await _orderManager.CancelAsync(order, OrdersConsts.InventoryReductionFailedAutoCancellationReason);
+                    await _orderManager.CancelAsync(
+                        order, OrdersConsts.InventoryReductionFailedAutoCancellationReason, true);
 
                     return;
                 }
@@ -76,7 +74,8 @@ namespace EasyAbp.EShop.Orders.Orders
                 {
                     var refundOrderEto = CreateRefundOrderEto(order);
 
-                    await _orderManager.CancelAsync(order, OrdersConsts.InventoryReductionFailedAutoCancellationReason);
+                    await _orderManager.CancelAsync(
+                        order, OrdersConsts.InventoryReductionFailedAutoCancellationReason, true);
 
                     await RefundOrderAsync(refundOrderEto);
 
diff --git a/modules/EasyAbp.EShop.Orders/test/EasyAbp.EShop.Orders.Domain.Tests/Orders/OrderDomainTests.cs b/modules/EasyAbp.EShop.Orders/test/EasyAbp.EShop.Orders.Domain.Tests/Orders/OrderDomainTests.cs
index e28f5e3c..6836ab02 100644
--- a/modules/EasyAbp.EShop.Orders/test/EasyAbp.EShop.Orders.Domain.Tests/Orders/OrderDomainTests.cs
+++ b/modules/EasyAbp.EShop.Orders/test/EasyAbp.EShop.Orders.Domain.Tests/Orders/OrderDomainTests.cs
@@ -64,9 +64,7 @@ namespace EasyAbp.EShop.Orders.Orders
                 "Key",
                 0.3m
             ));
-            Order1.SetPaymentId(OrderTestData.Payment1Id);
-            Order1.SetPaidTime(DateTime.Now);
-            
+
             orderRepository.GetAsync(OrderTestData.Order1Id).Returns(Task.FromResult(Order1));
 
             services.AddTransient(_ => orderRepository);
@@ -117,7 +115,10 @@ namespace EasyAbp.EShop.Orders.Orders
                     }
                 }
             });
-            
+
+            Order1.SetPaymentId(OrderTestData.Payment1Id);
+            Order1.SetPaidTime(DateTime.Now);
+
             Order1.RefundAmount.ShouldBe(0.3m);
             
             var orderLine1 = Order1.OrderLines.Single(x => x.Id == OrderTestData.OrderLine1Id);
@@ -133,6 +134,9 @@ namespace EasyAbp.EShop.Orders.Orders
         {
             var handler = ServiceProvider.GetRequiredService<RefundCompletedEventHandler>();
 
+            Order1.SetPaymentId(OrderTestData.Payment1Id);
+            Order1.SetPaidTime(DateTime.Now);
+
             await Should.ThrowAsync<InvalidRefundAmountException>(async () =>
             {
                 await handler.HandleEventAsync(new EShopRefundCompletedEto
@@ -174,6 +178,9 @@ namespace EasyAbp.EShop.Orders.Orders
         {
             var handler = ServiceProvider.GetRequiredService<RefundCompletedEventHandler>();
 
+            Order1.SetPaymentId(OrderTestData.Payment1Id);
+            Order1.SetPaidTime(DateTime.Now);
+
             await Should.ThrowAsync<InvalidRefundQuantityException>(async () =>
             {
                 await handler.HandleEventAsync(new EShopRefundCompletedEto
@@ -209,5 +216,32 @@ namespace EasyAbp.EShop.Orders.Orders
                 });
             });
         }
+
+        [Fact]
+        public async Task Should_Forbid_Canceling_Order_During_Payment_State()
+        {
+            var orderManager = ServiceProvider.GetRequiredService<IOrderManager>();
+            var order = await _orderRepository.GetAsync(OrderTestData.Order1Id);
+
+            order.SetPaymentId(Guid.NewGuid());
+            order.SetPaidTime(null);
+            await Should.ThrowAsync<OrderIsInWrongStageException>(() => orderManager.CancelAsync(order, "my-reason"));
+        }
+
+        [Fact]
+        public async Task Should_Forbid_Canceling_Order_During_Inventory_Reduction_State()
+        {
+            var orderManager = ServiceProvider.GetRequiredService<IOrderManager>();
+            var order = await _orderRepository.GetAsync(OrderTestData.Order1Id);
+
+            order.SetReducedInventoryAfterPlacingTime(null);
+            await Should.ThrowAsync<OrderIsInWrongStageException>(() => orderManager.CancelAsync(order, "my-reason"));
+
+            order.SetReducedInventoryAfterPlacingTime(DateTime.Now);
+            order.SetPaymentId(Guid.NewGuid());
+            order.SetPaidTime(DateTime.Now);
+            order.SetReducedInventoryAfterPlacingTime(null);
+            await Should.ThrowAsync<OrderIsInWrongStageException>(() => orderManager.CancelAsync(order, "my-reason"));
+        }
     }
 }
diff --git a/modules/EasyAbp.EShop.Products/src/EasyAbp.EShop.Products.Domain/EasyAbp/EShop/Products/Products/InventoryRollbackOrderCanceledEventHandler.cs b/modules/EasyAbp.EShop.Products/src/EasyAbp.EShop.Products.Domain/EasyAbp/EShop/Products/Products/InventoryRollbackOrderCanceledEventHandler.cs
index 386575b5..38a22766 100644
--- a/modules/EasyAbp.EShop.Products/src/EasyAbp.EShop.Products.Domain/EasyAbp/EShop/Products/Products/InventoryRollbackOrderCanceledEventHandler.cs
+++ b/modules/EasyAbp.EShop.Products/src/EasyAbp.EShop.Products.Domain/EasyAbp/EShop/Products/Products/InventoryRollbackOrderCanceledEventHandler.cs
@@ -28,7 +28,7 @@ namespace EasyAbp.EShop.Products.Products
         [UnitOfWork(true)]
         public virtual async Task HandleEventAsync(OrderCanceledEto eventData)
         {
-            if (eventData.Order.PaidTime.HasValue)
+            if (eventData.Order.PaidTime.HasValue || !eventData.Order.ReducedInventoryAfterPlacingTime.HasValue)
             {
                 return;
             }
diff --git a/modules/EasyAbp.EShop.Products/test/EasyAbp.EShop.Products.Domain.Tests/Products/InventoryRollbackTests.cs b/modules/EasyAbp.EShop.Products/test/EasyAbp.EShop.Products.Domain.Tests/Products/InventoryRollbackTests.cs
index 6a93e3bc..a4383ae3 100644
--- a/modules/EasyAbp.EShop.Products/test/EasyAbp.EShop.Products.Domain.Tests/Products/InventoryRollbackTests.cs
+++ b/modules/EasyAbp.EShop.Products/test/EasyAbp.EShop.Products.Domain.Tests/Products/InventoryRollbackTests.cs
@@ -25,40 +25,62 @@ namespace EasyAbp.EShop.Products.Products
         [Fact]
         public async Task Should_Roll_Back_ReduceAfterPlacing_Inventory_If_Order_Is_Not_Paid()
         {
-            await TestAsync(InventoryStrategy.ReduceAfterPlacing, false, true);
+            await TestAsync(InventoryStrategy.ReduceAfterPlacing, false, true, true);
         }
 
         [Fact]
         public async Task Should_Not_Roll_Back_ReduceAfterPlacing_Inventory_If_Order_Is_Paid()
         {
-            await TestAsync(InventoryStrategy.ReduceAfterPlacing, true, false);
+            await TestAsync(InventoryStrategy.ReduceAfterPlacing, true, true, false);
         }
 
         [Fact]
         public async Task Should_Not_Roll_Back_ReduceAfterPayment_Inventory_If_Order_Is_Not_Paid()
         {
-            await TestAsync(InventoryStrategy.ReduceAfterPayment, false, false);
+            await TestAsync(InventoryStrategy.ReduceAfterPayment, false, true, false);
         }
 
         [Fact]
         public async Task Should_Not_Roll_Back_ReduceAfterPayment_Inventory_If_Order_Is_Paid()
         {
-            await TestAsync(InventoryStrategy.ReduceAfterPayment, true, false);
+            await TestAsync(InventoryStrategy.ReduceAfterPayment, true, true, false);
         }
 
         [Fact]
         public async Task Should_Not_Roll_Back_NoNeed_Inventory_If_Order_Is_Not_Paid()
         {
-            await TestAsync(InventoryStrategy.NoNeed, false, false);
+            await TestAsync(InventoryStrategy.NoNeed, false, true, false);
         }
 
         [Fact]
         public async Task Should_Not_Roll_Back_NoNeed_Inventory_If_Order_Is_Paid()
         {
-            await TestAsync(InventoryStrategy.NoNeed, true, false);
+            await TestAsync(InventoryStrategy.NoNeed, true, true, false);
         }
 
-        protected async Task TestAsync(InventoryStrategy inventoryStrategy, bool orderPaid, bool expectRollback)
+        [Fact]
+        public async Task Should_Roll_Back_FlashSales_Inventory_If_Order_Is_Not_Paid()
+        {
+            await TestAsync(InventoryStrategy.FlashSales, false, true, true);
+        }
+
+        [Fact]
+        public async Task Should_Not_Roll_Back_FlashSales_Inventory_If_Order_Is_Paid()
+        {
+            await TestAsync(InventoryStrategy.FlashSales, true, true, false);
+        }
+
+        [Fact]
+        public async Task Should_Not_Roll_Back_Inventory_If_ReducedInventoryAfterPlacingTime_Is_Null()
+        {
+            await TestAsync(InventoryStrategy.NoNeed, true, false, false);
+            await TestAsync(InventoryStrategy.ReduceAfterPlacing, true, false, false);
+            await TestAsync(InventoryStrategy.ReduceAfterPayment, true, false, false);
+            await TestAsync(InventoryStrategy.FlashSales, true, false, false);
+        }
+
+        protected async Task TestAsync(InventoryStrategy inventoryStrategy, bool orderPaid,
+            bool hasReducedInventoryAfterPlacingTime, bool expectRollback)
         {
             var product = await ProductRepository.GetAsync(ProductsTestData.Product1Id);
             var productSku = product.ProductSkus.Single(x => x.Id == ProductsTestData.Product1Sku1Id);
@@ -98,7 +120,7 @@ namespace EasyAbp.EShop.Products.Products
                     CompletionTime = null,
                     CanceledTime = null,
                     CancellationReason = null,
-                    ReducedInventoryAfterPlacingTime = null,
+                    ReducedInventoryAfterPlacingTime = hasReducedInventoryAfterPlacingTime ? DateTime.Now : null,
                     ReducedInventoryAfterPaymentTime = null,
                     PaymentExpiration = null,
                     OrderLines = new List<OrderLineEto>