diff --git a/brep2sdf/networks/patch_graph.py b/brep2sdf/networks/patch_graph.py
index 5518389..249d586 100644
--- a/brep2sdf/networks/patch_graph.py
+++ b/brep2sdf/networks/patch_graph.py
@@ -100,7 +100,7 @@ class PatchGraph(nn.Module):
         if num_faces == 1:
             # 这里设置凸边是因为 后续会补一个 f2 = inf, h = min(f1, f2)
             # 因为 f2 = inf, 所以 h = f1
-            return 1  # 只有一个面 
+            return 0  # 只有一个面 
         if num_faces > 2:
             #logger.warning("get_operator 输入数量为{} > 2，将只取前两个面片进行处理".format(num_faces))
             node_faces = node_faces[:2]