diff --git a/src/scene/texture/transform/NormalMap.php b/src/scene/texture/transform/NormalMap.php
index fc9dcfd..8711544 100644
--- a/src/scene/texture/transform/NormalMap.php
+++ b/src/scene/texture/transform/NormalMap.php
@@ -29,6 +29,13 @@ class NormalMap extends TextureBase
         Base::__construct($config);
     }
 
+    /**
+     * @param object $texture 接收一个纹理对象，设置 texture 属性
+     */
+    public function setTexture($texture)
+    {
+        $this->texture = $this->judgeAttribute($texture);
+    }
 }
 
 ?>
diff --git a/src/utils/MatHelper.php b/src/utils/MatHelper.php
index dbe1b68..d14a934 100644
--- a/src/utils/MatHelper.php
+++ b/src/utils/MatHelper.php
@@ -115,7 +115,7 @@ class MatHelper{
             $scene->registerTexture($bumpTexture);
             
             $normalTexture = new NormalMap();
-            $normalTexture->texture = $bumpTexture;
+            $normalTexture->setTexture($bumpTexture);
             $normalTexture->scale = $matOriginal->matParams->bumpLevel;
             $scene->registerTexture($normalTexture);
             $material->setBumptex($normalTexture);