diff --git a/swift/pipelines/sampling/distill_sampler.py b/swift/pipelines/sampling/distill_sampler.py
index 825753edb0..61d2c6e9d3 100644
--- a/swift/pipelines/sampling/distill_sampler.py
+++ b/swift/pipelines/sampling/distill_sampler.py
@@ -32,7 +32,7 @@ def infer(
         for infer_request in infer_requests:
             completion = self.client.chat.completions.create(
                 model=self.model,
-                messages=infer_request['messages'],
+                messages=infer_request.messages,
                 temperature=request_config.temperature,
                 top_p=request_config.top_p,
                 max_tokens=request_config.max_tokens,