Typhoon Lekima (1909) is the third strongest typhoon to make landfall in Zhejiang during 1949 to 2019, affecting most provinces in central and eastern China, with high intensity of its wind and rain, significant extremity of rainstorms and serious disaster losses. The precipitation produced by Lekima mainly affected Zhejiang and Shandong, corresponding to the two major stages of the precipitation. To understand this process more comprehensively, this paper reviews and summarizes the same and different causes between two extreme precipitation stages caused by Lekima in terms of large-scale weather situation, the intensity of the typhoon, dynamic and thermal factors, cloud microphysics, transport of water vapor and energy and topography. The stable circulation and its good configuration, sufficient water vapor and energy, as well as the effect of binary typhoons are favorable factors throughout the whole extreme precipitation process. The high intensity of Lekima, the amplification by topography, good dynamic and thermal conditions and beneficial effects of cloud microphysics process are characteristic causes of the first extreme precipitation stage in Zhejiang, while characteristic causes of the second stage in Shandong are invasion by cold air from westerly trough and the prolonged effects of typhoon. Finally, the directions for further research are discussed.