diff --git a/FrmDiameterQuery.cs b/FrmDiameterQuery.cs
index 2b86a3b..fe7b1ca 100644
--- a/FrmDiameterQuery.cs
+++ b/FrmDiameterQuery.cs
@@ -2,8 +2,11 @@
 using System.Collections.Generic;
 using System.Data;
 using System.Drawing;
+using System.Linq;
 using System.Windows.Forms;
 using DevComponents.DotNetBar;
+using DevComponents.DotNetBar.Controls;
+using DXFLibrary;
 using GeoScene.Globe;
 
 namespace Cyberpipe
@@ -51,6 +54,7 @@
         private void FrmDiameterSel_Load(object sender, EventArgs e)
         {
             comboBoxEx1.Items.Clear();
+            List<string> tempString = new List<string>();
             for (int i = 0; i < globeControl1.Globe.Layers.Count; i++)//获取树节点后中所有的layer图层
             {
                 GSOLayer layer = globeControl1.Globe.Layers[i];
@@ -60,11 +64,16 @@
                     if (layer.Type == EnumLayerType.FeatureLayer && !name.Contains("\\") && !name.Contains("施工"))
                     {
                         if (name.EndsWith("管线") && name != "供电管线" && name != "电信管线")  // 消防、污水、供电、给水、电信、雨水，供电和电信表没有“管径”列
-                            comboBoxEx1.Items.Add(name);
+                        {
+                            //comboBoxEx1.Items.Add(name);
+                            tempString.Add(name);
+                        }
+                            
                     }
                 }
             }
 
+            tempString.Distinct().ToList().ForEach(s => comboBoxEx1.Items.Add(s));
 
             value = comboBoxEx2.Location.X - textBoxX2.Location.X;