Hi,
Thank you for writing to Microsoft Community Forums.
In order to get clarity on this issue and assist you with appropriate troubleshooting steps, please reply with the answers to the questions below.
- How are you trying to add Chinese Language to your computer?
- Do you want to completely change the system language to Chinese?
- Are you getting any error while adding the Chinese language?
I suggest you to follow the steps mentioned in Language packs and add Chinese Language to your Windows 10 computer.
For reference, you may also refer Manage your input and display language settings in Windows 10 and check if this helps.
If you would like me to provide additional advice, simply respond to this thread. I will get notified and I’ll reply to you as soon as I can.