The structural optimization of the trade in services in China: Based on the empirical comparison between China and the United States

China's trade in services structural optimization level is only in its infancy; trend of China's trade in services structural optimization has instability. This article innovatively selected 1994 to 2013 time series data of China and the United States, and analyzed the influential factors of comparative trade in services structure, including technological advance, human capital accumulation and physical capital accumulation. Analysis found that technological advance and human capital accumulation had a positive function in the United States' trade in services structural optimization while physical capital accumulation had a positive function in China's trade in services structural optimization. Based on the experience of trade in services structural optimization of United States and actual situation of our country, to optimize the trade in services structure of our country, we should pay attention to the accumulation of human capital and material capital, improve the level of science and technology.