Cyclonic storms, which occur over both Arabian Sea and the Bay of Bengal, account for about 10% of global tropical cyclones. Cyclonic storm over the Bay of Bengal is one of the main weather systems that cause heavy rainfall in Southwest China. In this paper, previous researches during last decades on genesis, track, lifespan, structure, development mechanism of cyclonic storms and its influences on China rainstorm are reviewed. Existent problems are pointed out.