diff --git a/opencompass/configs/datasets/chinese_simpleqa/chinese_simpleqa_gen.py b/opencompass/configs/datasets/chinese_simpleqa/chinese_simpleqa_gen.py
index 97c85510..6446ee13 100644
--- a/opencompass/configs/datasets/chinese_simpleqa/chinese_simpleqa_gen.py
+++ b/opencompass/configs/datasets/chinese_simpleqa/chinese_simpleqa_gen.py
@@ -17,7 +17,7 @@ subjective_infer_cfg = dict(
         ]),
     ),
     retriever=dict(type=ZeroRetriever),
-    inferencer=dict(type=GenInferencer, max_out_len=200),
+    inferencer=dict(type=GenInferencer, max_out_len=2048),
 )
 
 subjective_eval_cfg = dict(
@@ -29,6 +29,7 @@ subjective_eval_cfg = dict(
                 begin=[
                     dict(
                         role='SYSTEM',
+                        fallback_role='HUMAN',
                         prompt='{system_prompt}')
                 ],
                 round=[