The distribution and evolution characteristics of torrential rain of Lekima(1909) after its landfalling in China was researched based on hourly automatic weather station observations, three source merged precipitation data and NCEP/NCAR reanalysis data. The precipitation distribution and its relationship to large scale circulation and moisture flux were also analyzed. The results were as follows: there are three rainfall reinforcements after Lekima's landfalling, which happen at 3 hours, 14 hours and second morning after landfalling. Further study show that the rain rate after landfalling has also increased. The first distribution of heavy rainfall was mainly coursed by symmetric structure of typhoon circulation resulted from the maintenance of low-level jet and vapor flux. The second rainfall reinforcement closely related to the development and immobility of northern spiral rain band. The intrusion of dry cold air also contributed to asymmetric structure of rainfall. The third torrential rainfall happened in Shangdong Peninsula was resulted from the overlap of inverted typhoon trough and cold dry air.