diff --git a/Cad/ShaftRawFreeForgeRoundShaftDrawer.cs b/Cad/ShaftRawFreeForgeRoundShaftDrawer.cs
index 2a5e499..9faf608 100644
--- a/Cad/ShaftRawFreeForgeRoundShaftDrawer.cs
+++ b/Cad/ShaftRawFreeForgeRoundShaftDrawer.cs
@@ -64,6 +64,10 @@ namespace CadParamPluging.Cad
             double W = dia.Value;
             double H = len.Value;
 
+            // 获取原始值用于判断断线（防止缩放干扰）
+            var originalDia = ctx.OriginalBag?.GetDoubleOrNull(FeatureDrivenDrawer.KeyDiameter);
+            double originalW = originalDia.HasValue ? originalDia.Value : W;
+
             double ox = ctx.Center.X - W / 2.0;
             double oy = ctx.Center.Y - H / 2.0;
 
@@ -73,8 +77,20 @@ namespace CadParamPluging.Cad
             double maxR = Math.Min(W / 2.0, H / 2.0);
             if (filletR > maxR) filletR = maxR;
 
+            // 判断是否需要断线
+            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
-            DrawRectWithFillets(ctx, ox, oy, W, H, filletR, DrawingStyleManager.Role.OutlineBold);
+            if (needBreakLines)
+            {
+                double xBreak = ox + W / 4.0;
+                DrawRectWithBreak(ctx, ox, oy, W, H, filletR, xBreak, lineSpacing);
+            }
+            else
+            {
+                DrawRectWithFillets(ctx, ox, oy, W, H, filletR, DrawingStyleManager.Role.OutlineBold);
+            }
 
             // 2. 绘制左右两端的弧线（向外凸出）
             // 弧高设为 H/5（高度的1/5，确保弧高小于半弦长）
@@ -84,6 +100,12 @@ namespace CadParamPluging.Cad
             // 3. 绘制中心线 (横向，在中间位置)
             DrawHorizontalCenterLine(ctx, ctx.Center.Y, ox, ox + W);
 
+            // 4. 绘制断线 (如果需要)
+            if (needBreakLines)
+            {
+                DrawBreakLines(ctx, ox, oy, W, H);
+            }
+
             // 3. 尺寸标注
             
             // 3.1 直径标注 (底部)
@@ -163,7 +185,16 @@ namespace CadParamPluging.Cad
                 double pOx = ctx.Center.X - pW / 2.0;
                 double pOy = ctx.Center.Y - pH / 2.0;
 
-                DrawRectOutline(ctx, pOx, pOy, pW, pH, DrawingStyleManager.Role.PartContour);
+                if (needBreakLines)
+                {
+                    // 使用与锻件相同的断线X坐标和间距
+                    double xBreak = ox + W / 4.0;
+                    DrawRectOutlineWithBreak(ctx, pOx, pOy, pW, pH, xBreak, lineSpacing, DrawingStyleManager.Role.PartContour);
+                }
+                else
+                {
+                    DrawRectOutline(ctx, pOx, pOy, pW, pH, DrawingStyleManager.Role.PartContour);
+                }
             }
         }
 
@@ -300,5 +331,131 @@ namespace CadParamPluging.Cad
             }
             return newBag;
         }
+
+        /// <summary>
+        /// 绘制断线（使用 BreakLine 样式：白色 PHANTOM 双点划线）
+        /// </summary>
+        private static void DrawBreakLines(FeatureDrivenDrawer.DrawingContext ctx, double ox, double oy, double width, double height)
+        {
+            const double lineSpacing = 3.5;
+            const double extend = 5.0;
+
+            double xBreak = ox + width / 4.0;
+
+            double y0 = oy - extend;
+            double y1 = oy + height + extend;
+
+            var line1 = new Line(new Point3d(xBreak, y0, 0), new Point3d(xBreak, y1, 0));
+            ctx.Style?.Apply(line1, DrawingStyleManager.Role.BreakLine);
+            ctx.Btr.AppendEntity(line1);
+            ctx.Tr.AddNewlyCreatedDBObject(line1, true);
+
+            var line2 = new Line(new Point3d(xBreak + lineSpacing, y0, 0), new Point3d(xBreak + lineSpacing, y1, 0));
+            ctx.Style?.Apply(line2, DrawingStyleManager.Role.BreakLine);
+            ctx.Btr.AppendEntity(line2);
+            ctx.Tr.AddNewlyCreatedDBObject(line2, true);
+        }
+
+        /// <summary>
+        /// 绘制带断口的矩形轮廓（在断线位置打断上下横线）
+        /// </summary>
+        private static void DrawRectWithBreak(FeatureDrivenDrawer.DrawingContext ctx, double x, double y, double w, double h, double r, double xBreak, double breakWidth)
+        {
+            // 左边竖线
+            var leftLine = new Line(new Point3d(x, y, 0), new Point3d(x, y + h, 0));
+            ctx.Style?.Apply(leftLine, DrawingStyleManager.Role.OutlineBold);
+            ctx.Btr.AppendEntity(leftLine);
+            ctx.Tr.AddNewlyCreatedDBObject(leftLine, true);
+
+            // 右边竖线
+            var rightLine = new Line(new Point3d(x + w, y, 0), new Point3d(x + w, y + h, 0));
+            ctx.Style?.Apply(rightLine, DrawingStyleManager.Role.OutlineBold);
+            ctx.Btr.AppendEntity(rightLine);
+            ctx.Tr.AddNewlyCreatedDBObject(rightLine, true);
+
+            // 底边：断开 [xBreak, xBreak + breakWidth]
+            // 左段
+            var bottomLeft = new Line(new Point3d(x, y, 0), new Point3d(xBreak, y, 0));
+            ctx.Style?.Apply(bottomLeft, DrawingStyleManager.Role.OutlineBold);
+            ctx.Btr.AppendEntity(bottomLeft);
+            ctx.Tr.AddNewlyCreatedDBObject(bottomLeft, true);
+            // 右段
+            var bottomRight = new Line(new Point3d(xBreak + breakWidth, y, 0), new Point3d(x + w, y, 0));
+            ctx.Style?.Apply(bottomRight, DrawingStyleManager.Role.OutlineBold);
+            ctx.Btr.AppendEntity(bottomRight);
+            ctx.Tr.AddNewlyCreatedDBObject(bottomRight, true);
+
+            // 顶边：断开 [xBreak, xBreak + breakWidth]
+            // 左段
+            var topLeft = new Line(new Point3d(x, y + h, 0), new Point3d(xBreak, y + h, 0));
+            ctx.Style?.Apply(topLeft, DrawingStyleManager.Role.OutlineBold);
+            ctx.Btr.AppendEntity(topLeft);
+            ctx.Tr.AddNewlyCreatedDBObject(topLeft, true);
+            // 右段
+            var topRight = new Line(new Point3d(xBreak + breakWidth, y + h, 0), new Point3d(x + w, y + h, 0));
+            ctx.Style?.Apply(topRight, DrawingStyleManager.Role.OutlineBold);
+            ctx.Btr.AppendEntity(topRight);
+            ctx.Tr.AddNewlyCreatedDBObject(topRight, true);
+        }
+
+        /// <summary>
+        /// 绘制带断口的零件轮廓（在断线位置打断上下横线）
+        /// 支持自定义 Role (通常为 PartContour)
+        /// </summary>
+        private static void DrawRectOutlineWithBreak(FeatureDrivenDrawer.DrawingContext ctx, double x, double y, double w, double h, double xBreak, double breakWidth, DrawingStyleManager.Role role)
+        {
+            // 左边竖线
+            var leftLine = new Line(new Point3d(x, y, 0), new Point3d(x, y + h, 0));
+            ctx.Style?.Apply(leftLine, role);
+            ctx.Btr.AppendEntity(leftLine);
+            ctx.Tr.AddNewlyCreatedDBObject(leftLine, true);
+
+            // 右边竖线
+            var rightLine = new Line(new Point3d(x + w, y, 0), new Point3d(x + w, y + h, 0));
+            ctx.Style?.Apply(rightLine, role);
+            ctx.Btr.AppendEntity(rightLine);
+            ctx.Tr.AddNewlyCreatedDBObject(rightLine, true);
+
+            // 底边：断开 [xBreak, xBreak + breakWidth]
+            // 需要判断 xBreak 是否在当前矩形范围内
+            // 通常零件在锻件内部，且断线位置也会穿过零件
+            // 我们假设断线切断了矩形（如果 xBreak < x 或 xBreak > x+w，应该做特殊处理，这里暂不考虑极端情况）
+            
+            // 左段
+            if (xBreak > x)
+            {
+                var bottomLeft = new Line(new Point3d(x, y, 0), new Point3d(Math.Min(xBreak, x + w), y, 0));
+                ctx.Style?.Apply(bottomLeft, role);
+                ctx.Btr.AppendEntity(bottomLeft);
+                ctx.Tr.AddNewlyCreatedDBObject(bottomLeft, true);
+            }
+
+            // 右段
+            if (xBreak + breakWidth < x + w)
+            {
+                var bottomRight = new Line(new Point3d(Math.Max(xBreak + breakWidth, x), y, 0), new Point3d(x + w, y, 0));
+                ctx.Style?.Apply(bottomRight, role);
+                ctx.Btr.AppendEntity(bottomRight);
+                ctx.Tr.AddNewlyCreatedDBObject(bottomRight, true);
+            }
+
+            // 顶边：断开 [xBreak, xBreak + breakWidth]
+            // 左段
+            if (xBreak > x)
+            {
+                var topLeft = new Line(new Point3d(x, y + h, 0), new Point3d(Math.Min(xBreak, x + w), y + h, 0));
+                ctx.Style?.Apply(topLeft, role);
+                ctx.Btr.AppendEntity(topLeft);
+                ctx.Tr.AddNewlyCreatedDBObject(topLeft, true);
+            }
+            // 右段
+            if (xBreak + breakWidth < x + w)
+            {
+                var topRight = new Line(new Point3d(Math.Max(xBreak + breakWidth, x), y + h, 0), new Point3d(x + w, y + h, 0));
+                ctx.Style?.Apply(topRight, role);
+                ctx.Btr.AppendEntity(topRight);
+                ctx.Tr.AddNewlyCreatedDBObject(topRight, true);
+            }
+        }
     }
 }
diff --git a/Cad/ShaftRawFreeForgeSquareShaftDrawer.cs b/Cad/ShaftRawFreeForgeSquareShaftDrawer.cs
index 2adad81..b914214 100644
--- a/Cad/ShaftRawFreeForgeSquareShaftDrawer.cs
+++ b/Cad/ShaftRawFreeForgeSquareShaftDrawer.cs
@@ -220,7 +220,15 @@ namespace CadParamPluging.Cad
                 double pOx = ctx.Center.X - pL / 2.0;
                 double pOy = ctx.Center.Y - pH / 2.0;
 
-                DrawRectOutline(ctx, pOx, pOy, pL, pH, DrawingStyleManager.Role.PartContour);
+                if (needBreakLines)
+                {
+                    double xBreak = ox + S1 / 4.0;
+                    DrawRectOutlineWithBreak(ctx, pOx, pOy, pL, pH, xBreak, lineSpacing, DrawingStyleManager.Role.PartContour);
+                }
+                else
+                {
+                    DrawRectOutline(ctx, pOx, pOy, pL, pH, DrawingStyleManager.Role.PartContour);
+                }
             }
         }
 
@@ -444,6 +452,63 @@ namespace CadParamPluging.Cad
             ctx.Btr.AppendEntity(line);
             ctx.Tr.AddNewlyCreatedDBObject(line, true);
         }
+
+
+        /// <summary>
+        /// 绘制带断口的零件轮廓（在断线位置打断上下横线）
+        /// 支持自定义 Role (通常为 PartContour)
+        /// </summary>
+        private static void DrawRectOutlineWithBreak(FeatureDrivenDrawer.DrawingContext ctx, double x, double y, double w, double h, double xBreak, double breakWidth, DrawingStyleManager.Role role)
+        {
+            // 左边竖线
+            var leftLine = new Line(new Point3d(x, y, 0), new Point3d(x, y + h, 0));
+            ctx.Style?.Apply(leftLine, role);
+            ctx.Btr.AppendEntity(leftLine);
+            ctx.Tr.AddNewlyCreatedDBObject(leftLine, true);
+
+            // 右边竖线
+            var rightLine = new Line(new Point3d(x + w, y, 0), new Point3d(x + w, y + h, 0));
+            ctx.Style?.Apply(rightLine, role);
+            ctx.Btr.AppendEntity(rightLine);
+            ctx.Tr.AddNewlyCreatedDBObject(rightLine, true);
+
+            // 底边：断开 [xBreak, xBreak + breakWidth]
+            // 左段
+            if (xBreak > x)
+            {
+                var bottomLeft = new Line(new Point3d(x, y, 0), new Point3d(Math.Min(xBreak, x + w), y, 0));
+                ctx.Style?.Apply(bottomLeft, role);
+                ctx.Btr.AppendEntity(bottomLeft);
+                ctx.Tr.AddNewlyCreatedDBObject(bottomLeft, true);
+            }
+
+            // 右段
+            if (xBreak + breakWidth < x + w)
+            {
+                var bottomRight = new Line(new Point3d(Math.Max(xBreak + breakWidth, x), y, 0), new Point3d(x + w, y, 0));
+                ctx.Style?.Apply(bottomRight, role);
+                ctx.Btr.AppendEntity(bottomRight);
+                ctx.Tr.AddNewlyCreatedDBObject(bottomRight, true);
+            }
+
+            // 顶边：断开 [xBreak, xBreak + breakWidth]
+            // 左段
+            if (xBreak > x)
+            {
+                var topLeft = new Line(new Point3d(x, y + h, 0), new Point3d(Math.Min(xBreak, x + w), y + h, 0));
+                ctx.Style?.Apply(topLeft, role);
+                ctx.Btr.AppendEntity(topLeft);
+                ctx.Tr.AddNewlyCreatedDBObject(topLeft, true);
+            }
+            // 右段
+            if (xBreak + breakWidth < x + w)
+            {
+                var topRight = new Line(new Point3d(Math.Max(xBreak + breakWidth, x), y + h, 0), new Point3d(x + w, y + h, 0));
+                ctx.Style?.Apply(topRight, role);
+                ctx.Btr.AppendEntity(topRight);
+                ctx.Tr.AddNewlyCreatedDBObject(topRight, true);
+            }
+        }
     }
 }