The process of integration in the global economy driven by foreign business cycle fluctuations on China's economy has become increasingly evident. United States as the world's largest economy, the world economy has a significant impact, while the United States is China's most important trading partner, the most important foreign export market. From the close trade links between the two countries on the run, U.S. economic growth has an important role in China's economic development. Articles by examined the 1979-2010 China-US previous years, the operation of law of economic cycles and volatility characteristics of China and the U.S. business cycle synchronization features. Came to the conclusion, fluctuations in business cycle synchronization between the two countries occurred mainly after 2000 results.