Abstract: The research and progress of the warm-sector heavy rainfall in the south China coasts are introduced here. The main systems are the warm-sector convergence lines (the south convergence line and southwest convergence line) at low level and the landing easterly waves with rainstorm at medium-low level. The research is currently focusing on the features of division areas of the rainstorm system under background circulation, the classifying and detecting of systems, the system structure, the characteristics of the thermodynamics and moisture conditions, and the numerical simulations on environmental factor in fl uence, the dynamic and thermodynamic mechanisms of the warm-sector heavy rainfall, etc. The results show that the objective identi fi cation method helps to determine the warm-sector rainstorm systems and to follow their evolution. The latent heat release at the medium level is a main thermodynamic mechanism of the warm-sector rainstorm systems. The environmental factors including the sea surface temperature(SST) and the orographic forcing can increase intensity and lead trajectory to warm-sector rainstorm systems. Furthermore the configuration of influence factors and the systems can impact the intensity, location and duration of the warm-sctor rainstorm.