Accurate knowledge of extrveme rainfall mode (time distribution) is crucial for many fields, such as hydraulic structure design, flood control and reservoir operation. The rainstorm modes along the upper mainstream of Yangtze River (UMYR) during 2003–2016 were investigated by fuzzy mode identification method, linear regression and Mann–Kendall test. Results show that unimodal rainstorms are more frequently seen than bimodal on...