diff --git a/aspnet-core/modules/workflow/LINGYUN.Abp.WorkflowCore.LifeCycleEvent/LINGYUN/Abp/WorkflowCore/LifeCycleEvent/AbpEventBusProvider.cs b/aspnet-core/modules/workflow/LINGYUN.Abp.WorkflowCore.LifeCycleEvent/LINGYUN/Abp/WorkflowCore/LifeCycleEvent/AbpEventBusProvider.cs
index 400bb9fa0..0729a3f10 100644
--- a/aspnet-core/modules/workflow/LINGYUN.Abp.WorkflowCore.LifeCycleEvent/LINGYUN/Abp/WorkflowCore/LifeCycleEvent/AbpEventBusProvider.cs
+++ b/aspnet-core/modules/workflow/LINGYUN.Abp.WorkflowCore.LifeCycleEvent/LINGYUN/Abp/WorkflowCore/LifeCycleEvent/AbpEventBusProvider.cs
@@ -34,7 +34,7 @@ namespace LINGYUN.Abp.WorkflowCore.LifeCycleEvent
 
         public async Task PublishNotification(EventData evt)
         {
-            var data = evt.SerializeObject(_serializerSettings);
+            var data = evt.SerializeObject(serializerSettings: _serializerSettings);
             var wrapEvent = new LifeCycleEventWrap(data);
             await _eventBus.PublishAsync(wrapEvent);
         }
diff --git a/aspnet-core/modules/workflow/LINGYUN.Abp.WorkflowCore.Persistence.EntityFrameworkCore/LINGYUN/Abp/WorkflowCore/Persistence/EntityFrameworkCore/EfCoreWorkflowRepository.cs b/aspnet-core/modules/workflow/LINGYUN.Abp.WorkflowCore.Persistence.EntityFrameworkCore/LINGYUN/Abp/WorkflowCore/Persistence/EntityFrameworkCore/EfCoreWorkflowRepository.cs
index 9385fdbdb..9085f8189 100644
--- a/aspnet-core/modules/workflow/LINGYUN.Abp.WorkflowCore.Persistence.EntityFrameworkCore/LINGYUN/Abp/WorkflowCore/Persistence/EntityFrameworkCore/EfCoreWorkflowRepository.cs
+++ b/aspnet-core/modules/workflow/LINGYUN.Abp.WorkflowCore.Persistence.EntityFrameworkCore/LINGYUN/Abp/WorkflowCore/Persistence/EntityFrameworkCore/EfCoreWorkflowRepository.cs
@@ -36,5 +36,13 @@ namespace LINGYUN.Abp.WorkflowCore.Persistence
                 .PageBy(skip, take)
                 .ToListAsync();
         }
+
+        public override async Task<IQueryable<Workflow>> WithDetailsAsync()
+        {
+            var quertable = await base.WithDetailsAsync();
+            return quertable
+                .Include(x => x.ExecutionPointers)
+                    .ThenInclude(p => p.ExtensionAttributes);
+        }
     }
 }
diff --git a/aspnet-core/modules/workflow/LINGYUN.Abp.WorkflowCore.Persistence/LINGYUN/Abp/WorkflowCore/Persistence/Workflow.cs b/aspnet-core/modules/workflow/LINGYUN.Abp.WorkflowCore.Persistence/LINGYUN/Abp/WorkflowCore/Persistence/Workflow.cs
index 711328af9..278d5d738 100644
--- a/aspnet-core/modules/workflow/LINGYUN.Abp.WorkflowCore.Persistence/LINGYUN/Abp/WorkflowCore/Persistence/Workflow.cs
+++ b/aspnet-core/modules/workflow/LINGYUN.Abp.WorkflowCore.Persistence/LINGYUN/Abp/WorkflowCore/Persistence/Workflow.cs
@@ -35,8 +35,8 @@ namespace LINGYUN.Abp.WorkflowCore.Persistence
             int version,
             string description,
             string reference,
+            WorkflowStatus status,
             long? nextExecution = null,
-            WorkflowStatus status = WorkflowStatus.Terminated,
             DateTime? completeTime = null,
             Guid? tenantId = null) : base(id)
         {
diff --git a/aspnet-core/modules/workflow/LINGYUN.Abp.WorkflowCore.Persistence/LINGYUN/Abp/WorkflowCore/Persistence/WorkflowExtensions.cs b/aspnet-core/modules/workflow/LINGYUN.Abp.WorkflowCore.Persistence/LINGYUN/Abp/WorkflowCore/Persistence/WorkflowExtensions.cs
index 389016411..51f9531a1 100644
--- a/aspnet-core/modules/workflow/LINGYUN.Abp.WorkflowCore.Persistence/LINGYUN/Abp/WorkflowCore/Persistence/WorkflowExtensions.cs
+++ b/aspnet-core/modules/workflow/LINGYUN.Abp.WorkflowCore.Persistence/LINGYUN/Abp/WorkflowCore/Persistence/WorkflowExtensions.cs
@@ -46,7 +46,7 @@ namespace LINGYUN.Abp.WorkflowCore.Persistence
                 WorkflowDefinitionId = workflow.WorkflowDefinitionId,
                 CompleteTime = workflow.CompleteTime.ToNullableUtcDateTime(),
                 CreateTime = workflow.CreationTime.ToUtcDateTime(),
-                Data = workflow.Data.SerializeObject(),
+                Data = workflow.Data.DeserializeObject(),
                 Status = workflow.Status,
                 Description = workflow.Description,
                 NextExecution = workflow.NextExecution,
diff --git a/aspnet-core/modules/workflow/LINGYUN.Abp.WorkflowCore.Persistence/WorkflowCore/Models/WorkflowExtensions.cs b/aspnet-core/modules/workflow/LINGYUN.Abp.WorkflowCore.Persistence/WorkflowCore/Models/WorkflowExtensions.cs
index e5359fbd7..bb629884c 100644
--- a/aspnet-core/modules/workflow/LINGYUN.Abp.WorkflowCore.Persistence/WorkflowCore/Models/WorkflowExtensions.cs
+++ b/aspnet-core/modules/workflow/LINGYUN.Abp.WorkflowCore.Persistence/WorkflowCore/Models/WorkflowExtensions.cs
@@ -17,18 +17,19 @@ namespace WorkflowCore.Models
                 generator.Create(),
                 instance.CreateTime,
                 instance.WorkflowDefinitionId,
-                instance.Data.SerializeObject(),
+                instance.Data.SerializeObject(handlingString: true),
                 instance.Version,
                 instance.Description,
                 instance.Reference,
-                instance.NextExecution,
                 instance.Status,
+                instance.NextExecution,
                 instance.CompleteTime,
                 currentTenant.Id);
 
             foreach (var pointer in instance.ExecutionPointers)
             {
-                pointer.ToWorkflowExecutionPointer(workflow, generator, currentTenant);
+                var toPointer = pointer.ToWorkflowExecutionPointer(workflow, generator, currentTenant);
+                workflow.AddPointer(toPointer);
             }
 
             return workflow;
@@ -46,16 +47,16 @@ namespace WorkflowCore.Models
                 executionPointer.StepId,
                 executionPointer.StepName,
                 executionPointer.Active,
-                executionPointer.PersistenceData.SerializeObject(),
+                executionPointer.PersistenceData.SerializeObject(handlingString: true),
                 executionPointer.EventName,
                 executionPointer.EventKey,
                 executionPointer.EventPublished,
-                executionPointer.EventData.SerializeObject(),
+                executionPointer.EventData.SerializeObject(handlingString: true),
                 executionPointer.RetryCount,
                 executionPointer.Children.JoinAsString(";"),
-                executionPointer.ContextItem.SerializeObject(),
+                executionPointer.ContextItem.SerializeObject(handlingString: true),
                 executionPointer.PredecessorId,
-                executionPointer.Outcome.SerializeObject(),
+                executionPointer.Outcome.SerializeObject(handlingString: true),
                 executionPointer.Scope.JoinAsString(";"),
                 executionPointer.Status,
                 executionPointer.SleepUntil,
@@ -65,7 +66,7 @@ namespace WorkflowCore.Models
 
             foreach (var attribute in executionPointer.ExtensionAttributes)
             {
-                pointer.AddAttribute(attribute.Key, attribute.Value.SerializeObject());
+                pointer.AddAttribute(attribute.Key, attribute.Value.SerializeObject(handlingString: true));
             }
 
             executionPointer.Id = pointer.Id.ToString();
@@ -82,7 +83,7 @@ namespace WorkflowCore.Models
                 generator.Create(),
                 @event.EventName,
                 @event.EventKey,
-                @event.EventData.SerializeObject(),
+                @event.EventData.SerializeObject(handlingString: true),
                 @event.EventTime,
                 currentTenant.Id)
             {
@@ -105,7 +106,7 @@ namespace WorkflowCore.Models
                 subscription.EventName,
                 subscription.EventKey,
                 subscription.SubscribeAsOf,
-                subscription.SubscriptionData.SerializeObject(),
+                subscription.SubscriptionData.SerializeObject(handlingString: true),
                 subscription.ExternalToken,
                 subscription.ExternalWorkerId,
                 subscription.ExternalTokenExpiry,
diff --git a/aspnet-core/modules/workflow/LINGYUN.Abp.WorkflowCore/LINGYUN/Abp/WorkflowCore/WorkflowBase.cs b/aspnet-core/modules/workflow/LINGYUN.Abp.WorkflowCore/LINGYUN/Abp/WorkflowCore/WorkflowBase.cs
index 46bcbec89..836245a4e 100644
--- a/aspnet-core/modules/workflow/LINGYUN.Abp.WorkflowCore/LINGYUN/Abp/WorkflowCore/WorkflowBase.cs
+++ b/aspnet-core/modules/workflow/LINGYUN.Abp.WorkflowCore/LINGYUN/Abp/WorkflowCore/WorkflowBase.cs
@@ -3,7 +3,7 @@ using WorkflowCore.Interface;
 
 namespace LINGYUN.Abp.WorkflowCore
 {
-    public abstract class WorkflowBase : IWorkflow, ISingletonDependency
+    public abstract class WorkflowBase : IWorkflow, ITransientDependency
     {
         public abstract string Id { get; }
 
diff --git a/aspnet-core/modules/workflow/LINGYUN.Abp.WorkflowCore/System/ObjectSerializerExtensions.cs b/aspnet-core/modules/workflow/LINGYUN.Abp.WorkflowCore/System/ObjectSerializerExtensions.cs
index f157609ac..ef91e3f51 100644
--- a/aspnet-core/modules/workflow/LINGYUN.Abp.WorkflowCore/System/ObjectSerializerExtensions.cs
+++ b/aspnet-core/modules/workflow/LINGYUN.Abp.WorkflowCore/System/ObjectSerializerExtensions.cs
@@ -4,11 +4,11 @@ namespace System
 {
     public static class ObjectSerializerExtensions
     {
-        private static JsonSerializerSettings SerializerSettings = new JsonSerializerSettings() { TypeNameHandling = TypeNameHandling.All };
+        private readonly static JsonSerializerSettings SerializerSettings = new JsonSerializerSettings() { TypeNameHandling = TypeNameHandling.All };
 
-        public static string SerializeObject(this object obj, JsonSerializerSettings serializerSettings = null)
+        public static string SerializeObject(this object obj, bool handlingString = false, JsonSerializerSettings serializerSettings = null)
         {
-            if (obj is string objStr)
+            if (obj is string objStr && !handlingString)
             {
                 return objStr;
             }
@@ -17,7 +17,7 @@ namespace System
 
         public static object DeserializeObject(this string str, JsonSerializerSettings serializerSettings = null)
         {
-            return JsonConvert.DeserializeObject(str, serializerSettings ?? SerializerSettings);
+            return JsonConvert.DeserializeObject(str ?? string.Empty, serializerSettings ?? SerializerSettings);
         } 
     }
 }