diff --git a/MDM/Models/Process/Dto/ProcessOperationCollectParameterDto.cs b/MDM/Models/Process/Dto/ProcessOperationCollectParameterDto.cs
index c85c3b7..153d776 100644
--- a/MDM/Models/Process/Dto/ProcessOperationCollectParameterDto.cs
+++ b/MDM/Models/Process/Dto/ProcessOperationCollectParameterDto.cs
@@ -8,15 +8,15 @@ namespace MDM.Model.Process.Dto
     public class ProcessOperationCollectParameterQueryDto : PagerInfo
     {
 
-        public string FkRoutingCode { get; set; }
+        public string? FkRoutingCode { get; set; }
 
 
-        public string FkOperationCode { get; set; }
+        public string? FkOperationCode { get; set; }
 
 
-        public string ParameterCode { get; set; }
+        public string? ParameterCode { get; set; }
 
-        public string ParameterName { get; set; }
+        public string? ParameterName { get; set; }
     }
 
 
diff --git a/MDM/Models/Process/Dto/ProcessOperationFlowDto.cs b/MDM/Models/Process/Dto/ProcessOperationFlowDto.cs
index c7b98b1..7d4edea 100644
--- a/MDM/Models/Process/Dto/ProcessOperationFlowDto.cs
+++ b/MDM/Models/Process/Dto/ProcessOperationFlowDto.cs
@@ -13,17 +13,17 @@ namespace MDM.Models.Process.Dto
     {
 
 
-        public string FkRoutingCode { get; set; }
+        public string? FkRoutingCode { get; set; }
 
-        public string FkOperationCode { get; set; }
+        public string? FkOperationCode { get; set; }
 
-        public string FlowCode { get; set; }
+        public string? FlowCode { get; set; }
 
 
-        public string FlowTypeCode { get; set; }
+        public string? FlowTypeCode { get; set; }
 
 
-        public string FlowTypeName { get; set; }
+        public string? FlowTypeName { get; set; }
 
     }
 
diff --git a/MDM/Models/Process/Dto/ProcessOperationFlowMaterialParamterDto.cs b/MDM/Models/Process/Dto/ProcessOperationFlowMaterialParamterDto.cs
index e318820..50d4b8b 100644
--- a/MDM/Models/Process/Dto/ProcessOperationFlowMaterialParamterDto.cs
+++ b/MDM/Models/Process/Dto/ProcessOperationFlowMaterialParamterDto.cs
@@ -13,26 +13,26 @@ namespace MDM.Models.Process.Dto
         /// 所属工艺路线code 
         /// </summary>
      
-        public string FkRoutingCode { get; set; }
+        public string? FkRoutingCode { get; set; }
 
         /// <summary>
         /// 所属工序code 
         /// </summary>
 
-        public string FkOperationCode { get; set; }
+        public string? FkOperationCode { get; set; }
 
 
         /// <summary>
         /// 所属流程code 
         /// </summary>
     
-        public string FkFlowCode { get; set; }
+        public string? FkFlowCode { get; set; }
 
 
         /// <summary>
         /// 物料编码 
         /// </summary>
-        public string MaterialCode { get; set; }
+        public string? MaterialCode { get; set; }
 
 
 
@@ -40,12 +40,12 @@ namespace MDM.Models.Process.Dto
         /// 物料名称 
         /// </summary>
   
-        public string MaterialName { get; set; }
+        public string? MaterialName { get; set; }
 
 
         /// <summary>
         /// 防错规则 
         /// </summary>
-        public string UseErrorProofRuleCode { get; set; }
+        public string? UseErrorProofRuleCode { get; set; }
     }
 }
diff --git a/MDM/Models/Process/Dto/ProcessOperationWorkstationFlowCollectParameterDto.cs b/MDM/Models/Process/Dto/ProcessOperationWorkstationFlowCollectParameterDto.cs
index ab13aaa..440a33b 100644
--- a/MDM/Models/Process/Dto/ProcessOperationWorkstationFlowCollectParameterDto.cs
+++ b/MDM/Models/Process/Dto/ProcessOperationWorkstationFlowCollectParameterDto.cs
@@ -15,20 +15,20 @@ namespace MDM.Models.Process.Dto
         /// 工序路线code
         /// </summary>
      
-        public string FkRoutingCode { get; set; }
+        public string? FkRoutingCode { get; set; }
 
         /// <summary>
         /// 工序code 
         /// </summary>
 
-        public string FkOperationCode { get; set; }
+        public string? FkOperationCode { get; set; }
 
 
         /// <summary>
         /// 生产线体/工作中心code
         /// </summary>
       
-        public string FkProductlinebodyCode { get; set; }
+        public string? FkProductlinebodyCode { get; set; }
 
         /// <summary>
         /// 工位ID 
@@ -50,7 +50,7 @@ namespace MDM.Models.Process.Dto
         /// 参数名称，如：温度、压力、时间 
         /// </summary>
     
-        public string ParameterCode { get; set; }
+        public string? ParameterCode { get; set; }
 
 
 
@@ -67,7 +67,7 @@ namespace MDM.Models.Process.Dto
         /// 显示名称（用于UI展示，可和name一样） 
         /// </summary>
 
-        public string ParameterName { get; set; }
+        public string? ParameterName { get; set; }
 
         /// <summary>
         /// 参数描述，如：模具温度，用于热压工序 
@@ -78,12 +78,12 @@ namespace MDM.Models.Process.Dto
         /// 数据类型：FLOAT, INT, STRING, BOOL, AI（模拟量输入）等 
         /// </summary>
      
-        public string DataType { get; set; }
+        public string? DataType { get; set; }
 
         /// <summary>
         /// 单位，如：℃、MPa、秒、mm 
         /// </summary>
-        public string Unit { get; set; }
+        public string? Unit { get; set; }
 
         /// <summary>
         /// 标准/目标值（如目标温度 200.0 ℃）