Meiyu is a unique synoptic and climatological feature in East Asia and Meiyu frontal system is the key synoptic system which causes the seasonal maximum rainfall. The purpose of this paper is to analyze the scientific influence of the Meiyu research by the 10-year TAMEX project and also to review the author's recent research (5∼6 years) on major components of the Meiyu frontal systems. These include the mesoscale structure of the front and the mechanism of Meiyu frontogenesis, frontal movement, frontal cyclogenesis, and the formation of LLJ. Also, the observational and modeling studies of the upstream influence of the topographic effect is reviewed.