diff --git a/SGGL/FineUIPro.Web/HJGL/PreDesign/PipelingDivide.aspx b/SGGL/FineUIPro.Web/HJGL/PreDesign/PipelingDivide.aspx
index 8626aee5..ddca91a0 100644
--- a/SGGL/FineUIPro.Web/HJGL/PreDesign/PipelingDivide.aspx
+++ b/SGGL/FineUIPro.Web/HJGL/PreDesign/PipelingDivide.aspx
@@ -90,7 +90,7 @@
                                         </f:TextBox>
 
                                         <f:DropDownList ID="ddlFlowingSection" runat="server" Label="流水段"
-                                            Width="180px" LabelWidth="80px" LabelAlign="Right">
+                                            Width="180px" LabelWidth="80px" LabelAlign="Right" AutoSelectFirstItem="true">
                                         </f:DropDownList> 
                                         <f:DropDownList ID="ddlPipeArea" runat="server" Label="管线划分"
                                             Width="180px" LabelWidth="80px" LabelAlign="Right">
diff --git a/SGGL/FineUIPro.Web/HJGL/PreDesign/PipelingDivide.aspx.cs b/SGGL/FineUIPro.Web/HJGL/PreDesign/PipelingDivide.aspx.cs
index fa86df46..b437bdec 100644
--- a/SGGL/FineUIPro.Web/HJGL/PreDesign/PipelingDivide.aspx.cs
+++ b/SGGL/FineUIPro.Web/HJGL/PreDesign/PipelingDivide.aspx.cs
@@ -489,6 +489,7 @@ namespace FineUIPro.Web.HJGL.PreDesign
             this.ddlFlowingSection.DataSource = flowingSections.Select(x => new { FlowingSection = x }).ToList();
             this.ddlFlowingSection.DataBind();
             Funs.FineUIPleaseSelect(this.ddlFlowingSection, "-请选择-");
+            ddlFlowingSection.SelectedValue = Const._Null;
         }
 
         /// <summary>