diff --git a/src/Add-on/ACAD/DxfEntityConvert.ts b/src/Add-on/ACAD/DxfEntityConvert.ts
index c9d269d27..f0e980dd9 100644
--- a/src/Add-on/ACAD/DxfEntityConvert.ts
+++ b/src/Add-on/ACAD/DxfEntityConvert.ts
@@ -296,8 +296,8 @@ export function Conver2WebCADEntity(en: IEntity, doc: IDxf, ents: Entity[]): voi
             mtx.multiply(new Matrix4().makeRotationZ(MathUtils.DEG2RAD * blkRef.rotation));
 
         let scaleMtx: Matrix4;
-        if (blkRef.xScale)
-            scaleMtx = new Matrix4().makeScale(blkRef.xScale, blkRef.yScale, blkRef.zScale);
+        if (blkRef.xScale || blkRef.yScale || blkRef.zScale) //值可能为undefined
+            scaleMtx = new Matrix4().makeScale(blkRef.xScale ?? 1, blkRef.yScale ?? blkRef.xScale ?? 1, blkRef.zScale ?? blkRef.xScale ?? 1);
 
         let blk = doc.blocks[blkRef.name];
         if (blk)
diff --git a/src/Add-on/DXFLoad.ts b/src/Add-on/DXFLoad.ts
index 6229fcfdc..cb73f46df 100644
--- a/src/Add-on/DXFLoad.ts
+++ b/src/Add-on/DXFLoad.ts
@@ -1,8 +1,10 @@
 import { Intent } from "@blueprintjs/core";
+import { Vector3 } from "three";
 import { arrayLast } from "../Common/ArrayExt";
 import { Draw } from "../Common/Draw";
 import { FileSystem } from "../Common/FileSystem";
 import { CommandWrap } from "../Editor/CommandMachine";
+import { GetBox } from "../Geometry/GeUtils";
 import { AppToaster } from "../UI/Components/Toaster";
 import { Dxf2Entitys } from "./ACAD/DxfEntityConvert";
 import { Dwg2Dxf } from "./DwgLoader/DwgLoader";
@@ -31,31 +33,28 @@ export class Command_DWGDXFImport
 export async function DwgDxfImport(f: File)
 {
     let ext = arrayLast(f.name.split(".")).toUpperCase();
+    let dxfStr: string;
     if (ext === "DXF")
-    {
-        let str = await FileSystem.ReadFileAsText(f);
-
-        for (let e of Dxf2Entitys(str))
-            Draw(e);
-
-        AppToaster.show({
-            message: `成功导入${f.name}`,
-            intent: Intent.SUCCESS,
-            timeout: 3000,
-        });
-        return true;
-    }
+        dxfStr = await FileSystem.ReadFileAsText(f);
     else if (ext === "DWG")
+        dxfStr = await Dwg2Dxf(f);
+
+    let size = new Vector3;
+    for (let e of Dxf2Entitys(dxfStr))
     {
-        let dxfStr = await Dwg2Dxf(f);
-        for (let e of Dxf2Entitys(dxfStr))
-            Draw(e);
+        //校验实体有效性 避免出现nan的情况
+        let obj = e.DrawObject;
+        GetBox(obj).getSize(size);
+        if (isNaN(size.x) || isNaN(size.y) || isNaN(size.z))
+            continue;
 
-        AppToaster.show({
-            message: `成功导入${f.name}`,
-            intent: Intent.SUCCESS,
-            timeout: 3000,
-        });
-        return true;
+        Draw(e);
     }
+
+    AppToaster.show({
+        message: `成功导入${f.name}`,
+        intent: Intent.SUCCESS,
+        timeout: 3000,
+    });
+    return true;
 }