The method of statistical analysis is Applied to discuss the relationship between activity of tropical cyclone affecting Guangxi and the early or late,intensity of tropical monsoon onset by using conventional tropical cyclone data and the recent results of south China Sea monsoon experiment research. And then some statistical features are revealed. The results show that not only the enhancement of summer monsoon would promote tropical cyclone genesis but also when the monsoon air rolls into the tropical cyclone it would play a positive role in the development of cyclone.