Hi 韩256,
Thank you for participating in the Apple Support Communities. If you are having issues with your lock screen, here are a few steps that may be useful:
1. Restart your iPhone to see if the issue persists: Restart your iPhone - Apple Support
2. Update your iPhone to rule out the older software: Update your iPhone or iPad - Apple Support
3. Try the steps here to see if they help: Change your iPhone Lock Screen - Apple Support
4. If you need further support, reach out to Apple Support here: Get Support
Have a great day.