Abstract:The temporal and spatial distribution and variation characteristics and the rainstorm type of rainstorm were analyzed using long series hourly precipitation data of 7 precipitation stations in Nanjing region. The results show that the temporal and spatial distribution of rainstorm in Nanjing region is uneven, and the annual rainstorm amount and the number of rainstorm in urban area are more than that in suburban area. The annual maximum rainfall in different durations shows an increasing trend, and the increasing trend in the main urban area is more significant. The rainstorm mainly consists of general rainstorm and weak rainstorm, but the frequency of short duration and high intensity rainstorm which is easy to cause waterlogging shows an increasing trend, and the increasing trend of main urban area is more significant than that of suburban area. In the main urban area, weak rainstorm, medium rainstorm and heavy rainstorm have 14-, 8- and 3-year plentiful and withered circulation period, respectively. The extremely short rainstorm, short rainstorm and general rainstorm also have 3-year plentiful and withered circulation period. The rainstorm type(lasting for 12 hours)is the single peak type III rain, which is easy to cause waterlogging and increases the pressure of urban waterlogging control.