diff --git a/roboimi/vla/data/simpe_robot_dataset.py b/roboimi/vla/data/simpe_robot_dataset.py
index e18ecb9..4858e9d 100644
--- a/roboimi/vla/data/simpe_robot_dataset.py
+++ b/roboimi/vla/data/simpe_robot_dataset.py
@@ -87,6 +87,8 @@ class SimpleRobotDataset(Dataset):
                 if h5_path in f:
                     img = f[h5_path][meta["frame_idx"]]
                     img = torch.from_numpy(img).float()
+                    # 归一化到 [0, 1] 范围（与推理时保持一致）
+                    img = img / 255.0
                     frame[f"observation.{cam_name}"] = img.permute(2, 0, 1)  # HWC -> CHW
 
         return frame