diff --git a/src/Add-on/DrawDim/AutoDimBrs.ts b/src/Add-on/DrawDim/AutoDimBrs.ts
index 7cd6f5031..765a4f9ab 100644
--- a/src/Add-on/DrawDim/AutoDimBrs.ts
+++ b/src/Add-on/DrawDim/AutoDimBrs.ts
@@ -39,6 +39,7 @@ interface DirBrs
 const DEG90 = 90;//90°
 export class Command_AutoDimBrs implements Command
 {
+    maxThickness: number = 0;
     async exec()
     {
         //选择板件
@@ -55,11 +56,12 @@ export class Command_AutoDimBrs implements Command
             return;
 
         let brs = enRes.SelectSet.SelectEntityList as Board[];
-
+        this.maxThickness = 0;
         //原数据转二维数组[[br0],[br1],[br2],[br3],[br4]...],并记录每组的Box
         let brBoxs: Box3[] = [];
         let brGroups: Board[][] = brs.map(item =>
         {
+            this.maxThickness = Math.max(this.maxThickness, item.Thickness);
             brBoxs.push(item.BoundingBox);
             return [item];
         });
@@ -178,7 +180,7 @@ export class Command_AutoDimBrs implements Command
                 let ocs = new Matrix4().makeBasis(xv.normalize(), yv.negate().normalize(), zv.normalize());
                 ocs.setPosition(l.StartPoint);
 
-                let cuObb = new OBB(ocs, new Vector3(l.Length, 20, 20).multiplyScalar(0.5));
+                let cuObb = new OBB(ocs, new Vector3(l.Length, this.maxThickness ?? 20, this.maxThickness ?? 20).multiplyScalar(0.5));
                 let filterFunc = (b: Board) =>
                 {
                     if (!dirBrs[key].includes(b))