diff --git a/Cad/DrawingStyleManager.cs b/Cad/DrawingStyleManager.cs
index 6e75af6..8ed402f 100644
--- a/Cad/DrawingStyleManager.cs
+++ b/Cad/DrawingStyleManager.cs
@@ -59,7 +59,7 @@ namespace CadParamPluging.Cad
                 case Role.PartContour:
                     return new LayerSpec { LayerName = "双点划线", DefaultLinetypeName = "PHANTOM", DefaultLineWeight = LineWeight.LineWeight015, DefaultColorIndex = 7 };
                 case Role.Centerline:
-                    return new LayerSpec { LayerName = "中心线", DefaultLinetypeName = "Continuous", DefaultLineWeight = LineWeight.LineWeight015, DefaultColorIndex = 7 };
+                    return new LayerSpec { LayerName = "中心线", DefaultLinetypeName = "CENTER", DefaultLineWeight = LineWeight.LineWeight015, DefaultColorIndex = 7 };
                 case Role.Hidden:
                     return new LayerSpec { LayerName = "虚线", DefaultLinetypeName = "DASHED", DefaultLineWeight = LineWeight.LineWeight025, DefaultColorIndex = 7 };
                 case Role.Hatch:
diff --git a/Cad/FeatureDrivenDrawer.cs b/Cad/FeatureDrivenDrawer.cs
index 7586c5d..5495c94 100644
--- a/Cad/FeatureDrivenDrawer.cs
+++ b/Cad/FeatureDrivenDrawer.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using Autodesk.AutoCAD.DatabaseServices;
 using Autodesk.AutoCAD.Geometry;
 using CadParamPluging.Common;
@@ -573,7 +574,11 @@ namespace CadParamPluging.Cad
         /// </summary>
         private static void DrawRingSymmetryAxis(DrawingContext ctx, double ox, double oy, double height)
         {
-            var line = new Line(new Point3d(ox, oy - 10, 0), new Point3d(ox, oy + height + 10, 0));
+            // 直接使用“高度标注”的两端点（锻件外轮廓的上下边），不做上下延长，避免越过图框上边界。
+            var y0 = oy;
+            var y1 = oy + height;
+
+            var line = new Line(new Point3d(ox, y0, 0), new Point3d(ox, y1, 0));
             ctx.Style?.Apply(line, DrawingStyleManager.Role.Centerline);
             ctx.Btr.AppendEntity(line);
             ctx.Tr.AddNewlyCreatedDBObject(line, true);