If Chinese characters that you've given your products are not showing up on the BackOffice after you've imported the CSV file, we do have a solution for you to try.
Use Google Sheets to display Chinese characters correctly
Sign up for a Google account OR log in with your existing Google account and head to Google Sheets.
Click New and then upload the CSV you'd like to edit by going to File > Open > Upload.
After you've edited accordingly on Google Sheets, export your CSV by going to File > Download As > CSV (Comma Separated Value).
Upload the CSV file to the BackOffice > Products > Manage Products > Import CSV > Upload.
You should now be able to view your product names in Chinese characters in the BackOffice!