Hi Philmarsh7,
Thank you for reaching out to Microsoft Community.
I'm sorry but Surface devices bought in China can only be repaired in China also. For Microsoft to comply with local trade regulations, we are not able to ship or pick up your device to China for it to be repaired. Current warranty terms and conditions do not extend service for devices purchased abroad. You may check this page for more details on Warranties, extended service plans and Terms & Conditions for your device.
If this answer your question, we highly encourage you to inform our Community by clicking on Yes or marking my post as an answer. This will help other members who may have the same issue as you. Otherwise, don't hesitate to update us so we can further assist you.
Kind Regards,
Marrion Y.