diff --git a/wechat_cli/output/formatter.py b/wechat_cli/output/formatter.py
index 0b1891b..20138d6 100644
--- a/wechat_cli/output/formatter.py
+++ b/wechat_cli/output/formatter.py
@@ -6,8 +6,14 @@
 
 def output_json(data, file=None):
     file = file or sys.stdout
-    json.dump(data, file, ensure_ascii=False, indent=2)
-    file.write('\n')
+    # Encode to UTF-8 bytes to avoid encoding issues on Windows
+    json_str = json.dumps(data, ensure_ascii=False, indent=2) + '\n'
+    if hasattr(file, 'buffer'):
+        # Write bytes directly to binary buffer for proper UTF-8 encoding
+        file.buffer.write(json_str.encode('utf-8'))
+    else:
+        # Fallback for file objects without buffer attribute
+        file.write(json_str)
 
 
 def output_text(text, file=None):