Hi @汪立铭 ,
This happens when there's a problem with your computer contacting the Windows Update servers. Normally you want to stop the update service, clear any cached items, and restart the service. The Windows Update troubleshoot in Windows 10 will handle this for you.
- Select Start > Settings > Update & Security
- Select Troubleshoot > Additional troubleshooters > Windows Update
Allow the troubleshoot to run and attempt again from the Turn Windows Features on or off dialog.
You can also check out this youtube video if the above steps don't help resolve the issue.