diff --git a/Cad/ShaftRawFreeForgeRoundShaftDrawer.cs b/Cad/ShaftRawFreeForgeRoundShaftDrawer.cs
index 9faf608..fcf7753 100644
--- a/Cad/ShaftRawFreeForgeRoundShaftDrawer.cs
+++ b/Cad/ShaftRawFreeForgeRoundShaftDrawer.cs
@@ -81,10 +81,12 @@ namespace CadParamPluging.Cad
             bool needBreakLines = originalW > 150;
             const double lineSpacing = 3.5;
 
+            // 1. 绘制主体轮廓 (矩形 + 圆角) - 保持原来的白色边框
+            double xBreak = ox + W / 4.0;
+
             // 1. 绘制主体轮廓 (矩形 + 圆角) - 保持原来的白色边框
             if (needBreakLines)
             {
-                double xBreak = ox + W / 4.0;
                 DrawRectWithBreak(ctx, ox, oy, W, H, filletR, xBreak, lineSpacing);
             }
             else
@@ -98,7 +100,7 @@ namespace CadParamPluging.Cad
             DrawEndArcs(ctx, ox, oy, W, H, arcHeight);
 
             // 3. 绘制中心线 (横向，在中间位置)
-            DrawHorizontalCenterLine(ctx, ctx.Center.Y, ox, ox + W);
+            DrawHorizontalCenterLine(ctx, ctx.Center.Y, ox, ox + W, needBreakLines, xBreak, lineSpacing);
 
             // 4. 绘制断线 (如果需要)
             if (needBreakLines)
@@ -188,7 +190,7 @@ namespace CadParamPluging.Cad
                 if (needBreakLines)
                 {
                     // 使用与锻件相同的断线X坐标和间距
-                    double xBreak = ox + W / 4.0;
+                    // double xBreak = ox + W / 4.0; // variable is already declared in outer scope
                     DrawRectOutlineWithBreak(ctx, pOx, pOy, pW, pH, xBreak, lineSpacing, DrawingStyleManager.Role.PartContour);
                 }
                 else
@@ -295,13 +297,31 @@ namespace CadParamPluging.Cad
             }
         }
 
-        private static void DrawHorizontalCenterLine(FeatureDrivenDrawer.DrawingContext ctx, double centerY, double xLeft, double xRight)
+        private static void DrawHorizontalCenterLine(FeatureDrivenDrawer.DrawingContext ctx, double centerY, double xLeft, double xRight, bool hasBreak = false, double xBreak = 0, double breakWidth = 0)
         {
              const double extend = 5.0;
-             var line = new Line(new Point3d(xLeft - extend, centerY, 0), new Point3d(xRight + extend, centerY, 0));
-             ctx.Style?.Apply(line, DrawingStyleManager.Role.Centerline);
-             ctx.Btr.AppendEntity(line);
-             ctx.Tr.AddNewlyCreatedDBObject(line, true);
+             
+             if (!hasBreak)
+             {
+                 var line = new Line(new Point3d(xLeft - extend, centerY, 0), new Point3d(xRight + extend, centerY, 0));
+                 ctx.Style?.Apply(line, DrawingStyleManager.Role.Centerline);
+                 ctx.Btr.AppendEntity(line);
+                 ctx.Tr.AddNewlyCreatedDBObject(line, true);
+             }
+             else
+             {
+                 // Left segment
+                 var line1 = new Line(new Point3d(xLeft - extend, centerY, 0), new Point3d(xBreak, centerY, 0));
+                 ctx.Style?.Apply(line1, DrawingStyleManager.Role.Centerline);
+                 ctx.Btr.AppendEntity(line1);
+                 ctx.Tr.AddNewlyCreatedDBObject(line1, true);
+
+                 // Right segment
+                 var line2 = new Line(new Point3d(xBreak + breakWidth, centerY, 0), new Point3d(xRight + extend, centerY, 0));
+                 ctx.Style?.Apply(line2, DrawingStyleManager.Role.Centerline);
+                 ctx.Btr.AppendEntity(line2);
+                 ctx.Tr.AddNewlyCreatedDBObject(line2, true);
+             }
         }
 
         private static ParamBag ScaleParamBag(ParamBag original, double scaleFactor)
diff --git a/Cad/ShaftRawFreeForgeSquareShaftDrawer.cs b/Cad/ShaftRawFreeForgeSquareShaftDrawer.cs
index b914214..7eb2b8f 100644
--- a/Cad/ShaftRawFreeForgeSquareShaftDrawer.cs
+++ b/Cad/ShaftRawFreeForgeSquareShaftDrawer.cs
@@ -81,10 +81,12 @@ namespace CadParamPluging.Cad
             bool needBreakLines = originalS1 > 150;
             const double lineSpacing = 3.5;
 
+            // 1. Draw Main View - 如果需要断线，则绘制带缺口的轮廓
+            double xBreak = ox + S1 / 4.0;
+
             // 1. Draw Main View - 如果需要断线，则绘制带缺口的轮廓
             if (needBreakLines)
             {
-                double xBreak = ox + S1 / 4.0;
                 DrawRectWithBreak(ctx, ox, oy, S1, S2, filletR, xBreak, lineSpacing);
             }
             else
@@ -98,7 +100,7 @@ namespace CadParamPluging.Cad
             DrawEndArcs(ctx, ox, oy, S1, S2, arcHeight);
 
             // 3. 绘制中心线 (横向，在中间位置)
-            DrawHorizontalCenterLine(ctx, ctx.Center.Y, ox, ox + S1);
+            DrawHorizontalCenterLine(ctx, ctx.Center.Y, ox, ox + S1, needBreakLines, xBreak, lineSpacing);
 
             // 4. Draw Break Lines if needed
             if (needBreakLines)
@@ -222,7 +224,7 @@ namespace CadParamPluging.Cad
 
                 if (needBreakLines)
                 {
-                    double xBreak = ox + S1 / 4.0;
+                    // double xBreak = ox + S1 / 4.0; // variable is already declared in outer scope
                     DrawRectOutlineWithBreak(ctx, pOx, pOy, pL, pH, xBreak, lineSpacing, DrawingStyleManager.Role.PartContour);
                 }
                 else
@@ -444,13 +446,31 @@ namespace CadParamPluging.Cad
             }
         }
 
-        private static void DrawHorizontalCenterLine(FeatureDrivenDrawer.DrawingContext ctx, double centerY, double xLeft, double xRight)
+        private static void DrawHorizontalCenterLine(FeatureDrivenDrawer.DrawingContext ctx, double centerY, double xLeft, double xRight, bool hasBreak = false, double xBreak = 0, double breakWidth = 0)
         {
             const double extend = 5.0;
-            var line = new Line(new Point3d(xLeft - extend, centerY, 0), new Point3d(xRight + extend, centerY, 0));
-            ctx.Style?.Apply(line, DrawingStyleManager.Role.Centerline);
-            ctx.Btr.AppendEntity(line);
-            ctx.Tr.AddNewlyCreatedDBObject(line, true);
+            
+            if (!hasBreak)
+            {
+                var line = new Line(new Point3d(xLeft - extend, centerY, 0), new Point3d(xRight + extend, centerY, 0));
+                ctx.Style?.Apply(line, DrawingStyleManager.Role.Centerline);
+                ctx.Btr.AppendEntity(line);
+                ctx.Tr.AddNewlyCreatedDBObject(line, true);
+            }
+            else
+            {
+                // Left segment
+                var line1 = new Line(new Point3d(xLeft - extend, centerY, 0), new Point3d(xBreak, centerY, 0));
+                ctx.Style?.Apply(line1, DrawingStyleManager.Role.Centerline);
+                ctx.Btr.AppendEntity(line1);
+                ctx.Tr.AddNewlyCreatedDBObject(line1, true);
+
+                // Right segment
+                var line2 = new Line(new Point3d(xBreak + breakWidth, centerY, 0), new Point3d(xRight + extend, centerY, 0));
+                ctx.Style?.Apply(line2, DrawingStyleManager.Role.Centerline);
+                ctx.Btr.AppendEntity(line2);
+                ctx.Tr.AddNewlyCreatedDBObject(line2, true);
+            }
         }