The Roku will work just fine. However, most, if not all of your installed channels will likely no longer work. With a few exceptions, Roku providers restrict their offerings by geographical locations. In addition, your Roku user account is based in the country you are currently in, so channel availability will differ from what's available in China. I wouldn't be surprised if there are no channels available for the Chinese market, but I have no idea what might be there.
In general, when a Roku is moved to a different country, a new user account must be created from an Internet account in that country, and the Roku must be factory reset to link it to the new account. Only then will channels available in the new country be visible in the Roku channel store. Just don't have any expectation of using the channels you use today. And again, this isn't any restriction on the part of Roku. It's completely up to the channel providers to determine where their content is available.
Dan
Roku Community Streaming Expert
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