diff --git a/brep2sdf/train.py b/brep2sdf/train.py
index ee098a1..0023c8f 100644
--- a/brep2sdf/train.py
+++ b/brep2sdf/train.py
@@ -113,22 +113,28 @@ class Trainer:
             # 清空梯度
             self.optimizer.zero_grad()
             
-            # 获取数据并移动到设备
-            surf_ncs = batch['surf_ncs'].to(self.device)
-            edge_ncs = batch['edge_ncs'].to(self.device)
-            surf_pos = batch['surf_pos'].to(self.device)
-            edge_pos = batch['edge_pos'].to(self.device)
-            vertex_pos = batch['vertex_pos'].to(self.device)
+            # 获取数据并移动到设备，同时设置梯度
+            surf_ncs = batch['surf_ncs'].to(self.device).requires_grad_(True)
+            edge_ncs = batch['edge_ncs'].to(self.device).requires_grad_(True)
+            surf_pos = batch['surf_pos'].to(self.device).requires_grad_(True)
+            edge_pos = batch['edge_pos'].to(self.device).requires_grad_(True)
+            vertex_pos = batch['vertex_pos'].to(self.device).requires_grad_(True)
+            points = batch['points'].to(self.device).requires_grad_(True)
+            
+            # 这些不需要梯度
             edge_mask = batch['edge_mask'].to(self.device)
             points = batch['points'].to(self.device)
             gt_sdf = batch['sdf'].to(self.device)
             
             # 前向传播
             pred_sdf = self.model(
-                surf_ncs=surf_ncs, edge_ncs=edge_ncs,
-                surf_pos=surf_pos, edge_pos=edge_pos,
-                vertex_pos=vertex_pos, edge_mask=edge_mask,
-                query_points=points  # 只使用点坐标，不包括SDF值
+                surf_ncs=surf_ncs, 
+                edge_ncs=edge_ncs,
+                surf_pos=surf_pos, 
+                edge_pos=edge_pos,
+                vertex_pos=vertex_pos, 
+                edge_mask=edge_mask,
+                query_points=points
             )
             
             # 计算损失