diff --git a/src/llmtuner/train/tuner.py b/src/llmtuner/train/tuner.py
index 2d57f448..c24e5eac 100644
--- a/src/llmtuner/train/tuner.py
+++ b/src/llmtuner/train/tuner.py
@@ -56,12 +56,11 @@ def export_model(args: Optional[Dict[str, Any]] = None):
     if not isinstance(model, PreTrainedModel):
         raise ValueError("The model is not a `PreTrainedModel`, export aborted.")
 
-    setattr(model.config, "use_cache", True)
-    if getattr(model.config, "torch_dtype", None) == torch.bfloat16:
-        model = model.to(torch.bfloat16).to("cpu")
+    if hasattr(model.config, "torch_dtype"):
+        model = model.to(getattr(model.config, "torch_dtype")).to("cpu")
     else:
         model = model.to(torch.float16).to("cpu")
-        setattr(model.config, "torch_dtype", "float16")
+        setattr(model.config, "torch_dtype", torch.float16)
 
     model.save_pretrained(
         save_directory=model_args.export_dir,