diff --git a/examples/rs_research/train_cd.py b/examples/rs_research/train_cd.py
index f0c0410..f737ef5 100644
--- a/examples/rs_research/train_cd.py
+++ b/examples/rs_research/train_cd.py
@@ -92,7 +92,7 @@ model.train(
     num_epochs=50,
     train_dataset=train_dataset,
     train_batch_size=8,
-    eval_dataset=eval_dataset,
+    eval_dataset=val_dataset,
     # 每多少个epoch验证并保存一次模型
     save_interval_epochs=5,
     # 每多少次迭代记录一次日志