diff --git a/Cad/FeatureDrivenDrawer.cs b/Cad/FeatureDrivenDrawer.cs
index 0314f98..4eae711 100644
--- a/Cad/FeatureDrivenDrawer.cs
+++ b/Cad/FeatureDrivenDrawer.cs
@@ -1905,7 +1905,7 @@ namespace CadParamPluging.Cad
             TrySetDimProp(dim, "Dimasz", 2.5);
             TrySetDimProp(dim, "Dimgap", 1.0);
             TrySetDimProp(dim, "Dimexe", 1.0);
-            TrySetDimProp(dim, "Dimexo", 1.0);
+            TrySetDimProp(dim, "Dimexo", 0.0);
 
             // Updated based on user request
             TrySetDimProp(dim, "Dimtofl", true); // Draw dim line between ext lines
diff --git a/Cad/TemplateDrawingService.cs b/Cad/TemplateDrawingService.cs
index ce00fec..b6e8f23 100644
--- a/Cad/TemplateDrawingService.cs
+++ b/Cad/TemplateDrawingService.cs
@@ -1605,7 +1605,12 @@ namespace CadParamPluging.Cad
                         var isBottomEdge = Math.Abs(startPt.Y - layout.MinPoint.Y) < tolerance;
                         if (isTopEdge || isBottomEdge)
                         {
-                            return true;
+                            // 增加长度判断：防止误删位于边界上的短线（如标题栏边框）
+                            // 只有长度超过布局宽度 50% 的线才认为是外框
+                            if (Math.Abs(startPt.X - endPt.X) > layoutWidth * 0.5)
+                            {
+                                return true;
+                            }
                         }
                     }
 
@@ -1618,7 +1623,11 @@ namespace CadParamPluging.Cad
                         var isRightEdge = Math.Abs(startPt.X - layout.MaxPoint.X) < tolerance;
                         if (isLeftEdge || isRightEdge)
                         {
-                            return true;
+                            // 增加长度判断
+                            if (Math.Abs(startPt.Y - endPt.Y) > layoutHeight * 0.5)
+                            {
+                                return true;
+                            }
                         }
                     }
                 }