diff --git a/plugins/check_zhenxun_update/data_source.py b/plugins/check_zhenxun_update/data_source.py
index 7bf6efd4..87ac12d1 100644
--- a/plugins/check_zhenxun_update/data_source.py
+++ b/plugins/check_zhenxun_update/data_source.py
@@ -89,10 +89,12 @@ async def check_update(bot: Bot) -> 'int, str':
                 update_info = data["body"]
                 width = 0
                 height = len(update_info.split('\n')) * 24
-                for m in update_info.split('\n'):
-                    if len(m) * 20 > width:
-                        width = len(m) * 18
                 A = CreateImg(width, height, font_size=20)
+                for m in update_info.split('\n'):
+                    w, h = A.getsize(m)
+                    if w > width:
+                        width = w
+                A = CreateImg(width + 50, height, font_size=20)
                 A.text((10, 10), update_info)
                 A.save(f'{IMAGE_PATH}/update_info.png')
                 await bot.send_private_msg(