diff --git a/brep2sdf/data/sampler.py b/brep2sdf/data/sampler.py
index 8f64795..2d5c79a 100644
--- a/brep2sdf/data/sampler.py
+++ b/brep2sdf/data/sampler.py
@@ -211,11 +211,20 @@ def sample_zero_surface_points_and_normals(
         # 获取每个点所在的三角面片的法线
         normals = trimesh_mesh_ncs.face_normals[face_indices]
 
+
+        # 检查 face_normals 是否已归一化
+        normals_norm = np.linalg.norm(normals, axis=1)
+        if not np.allclose(normals_norm, 1.0, atol=1e-5):
+            print("⚠️ 注意：face_normals 未归一化，正在手动归一化...")
+            normals = normals / (normals_norm.reshape(-1, 1) + 1e-8)
+
+
         # 构造 sdf 标签为 0 的列
         sdf_zeros = np.zeros((num_samples, 1), dtype=np.float32)
 
         # 合并为 (N, 7) 的数组 [xyz, normal, sdf=0]
         points_with_normals_sdf = np.hstack([points, normals, sdf_zeros], dtype=np.float32)
+        np.random.shuffle(points_with_normals_sdf)
 
         return points_with_normals_sdf