diff --git a/SGGL/FineUIPro.Web/ProjectData/UnitWorkEdit.aspx.cs b/SGGL/FineUIPro.Web/ProjectData/UnitWorkEdit.aspx.cs
index 60187208..ba2c03b3 100644
--- a/SGGL/FineUIPro.Web/ProjectData/UnitWorkEdit.aspx.cs
+++ b/SGGL/FineUIPro.Web/ProjectData/UnitWorkEdit.aspx.cs
@@ -99,15 +99,15 @@ namespace FineUIPro.Web.ProjectData
             UnitWork.ProjectId = this.CurrUser.LoginProjectId;
             UnitWork.UnitWorkCode = this.txtUnitWorkCode.Text.Trim();
             UnitWork.UnitWorkName = this.txtUnitWorkName.Text.Trim();
-            if (this.drpUnit.SelectedValue != BLL.Const._Null)
-            {
-                UnitWork.UnitId = string.Join(",", this.drpUnit.SelectedValueArray);
-            }
-            else
+            if (this.drpUnit.SelectedValue == BLL.Const._Null && this.drpUnit.SelectedValueArray.Length == 1)
             {
                 Alert.ShowInTop("请选择施工单位！");
                 return;
             }
+            else
+            {
+                UnitWork.UnitId = string.Join(",", this.drpUnit.SelectedValueArray);
+            }
             if (this.drpSupervisorUnit.SelectedValue != BLL.Const._Null)
             {
                 UnitWork.SupervisorUnitId = this.drpSupervisorUnit.SelectedValue;