It should be able to support Chinese characters one way or another since it can display graphics as well as text. So in the worst case you could make a graphics file with your Chinese characters and burn the graphics image. But I suspect you won't even have to do this and will be able to enter Chinese characters directly.
Please keep in mind that DiscT@2 writes on the data side of the disc, and thus reduces the amount of data you can write to the disc. Many people are under the mistaken impression that the DiscT@2 is somehow written to the top of the disc. This is not so. The same laser that burns the data burns the DiscT@2, and it burns it in the data groove of the disc. Thus, the larger the DiscT@2 label, the less actual data you will be able to burn on the disc. I think most people eventually decided that DiscT@2 was just a gimmick with little practical value. It is a very neat gimmick, mind you, but a gimmick nonetheless.
As dodecahedron said, you will have to act fast to get one of these burners since Yamaha quit the burner business a number of months ago, and no longer makes these drives.