diff --git a/opencompass/openicl/icl_retriever/icl_votek_retriever.py b/opencompass/openicl/icl_retriever/icl_votek_retriever.py
index ab81ad0e..ceddfb9d 100644
--- a/opencompass/openicl/icl_retriever/icl_votek_retriever.py
+++ b/opencompass/openicl/icl_retriever/icl_votek_retriever.py
@@ -42,7 +42,7 @@ class VotekRetriever(TopkRetriever):
                      vote_file=None):
         n = len(embeddings)
         if vote_file is not None and os.path.isfile(vote_file):
-            with open(vote_file) as f:
+            with open(vote_file, encoding='utf-8') as f:
                 vote_stat = json.load(f)
         else:
             vote_stat = defaultdict(list)
diff --git a/opencompass/utils/summarizer.py b/opencompass/utils/summarizer.py
index a6704b68..aefa8c94 100644
--- a/opencompass/utils/summarizer.py
+++ b/opencompass/utils/summarizer.py
@@ -205,7 +205,7 @@ class Summarizer:
 
         output_dir = osp.split(output_path)[0]
         mmengine.mkdir_or_exist(output_dir)
-        with open(output_path, 'w') as f:
+        with open(output_path, 'w', encoding='utf-8') as f:
             f.write(time_str + '\n')
             f.write('tabulate format\n')
             f.write('^' * 128 + '\n')
@@ -228,6 +228,6 @@ class Summarizer:
             content += f'详细评测汇总已输出至 {osp.abspath(output_path)}'
             self.lark_reporter.post(content)
 
-        with open(output_csv_path, 'w') as f:
+        with open(output_csv_path, 'w', encoding='utf-8') as f:
             f.write('\n'.join([','.join(row) for row in table]) + '\n')
         self.logger.info(f'write csv to {osp.abspath(output_csv_path)}')