In this paper, we mainly do the comparative study on competitiveness of trade in service between China and the USA. Firstly, we introduct some basic concepts of trade in services, and proposes the index system in the competitiveness of trade in service. And then, a large amount of data of Sino-US trade comparative analysis is used for comparative analysis, and point out that there is a gap between modem Sino-US service trade. Finally, we summarize the paper and give some advices to improve the competitiveness of China.