Wind partitioning and Shuman-Shapiro filtering are used to analyze the dynamic characteristics of the local inland heavy precipitation in Zhejiang induced by Typhoon Yagi (2018)based on NCEP / NCAR 0. 25° ×0. 25° reanalysis data and forecast products，black-body temperature (TBB) from FY-2E meteorological satellite，and observations from radars and automatic meteorological stations． The results are as follows． (1)A vortex located in front of the typhoon (junction of Zhejiang，Fujian， and Jiangxi provinces)has a certain effect on the circulation in the middle and upper level，resulting in an asymmetric structure of typhoon circulation with typhoon center tilting to the southeast from low to high level． (2)Convergence at 925 hPa caused by inflow has a coupling effect with divergence at 700 hPa caused by outflow in front of the typhoon (along the downshear of low-level vertical wind shear)． (3)The boundary layer convergence and surface convergence line are maintained in front of the typhoon for a long time and the westward movement of positive vorticity column with the typhoon leads to low-level convergence and duplicate effect in central Zhejiang，which is conducive to the inland heavy precipitation there． (4 ) The convergence of easterly flow，inflow in boundary layer，and the strengthening of southwesterly flow all contribute to the long-term maintaining of boundary layer convergence in central Zhejiang． In addition，the topographic effect also has a positive effect on the local inland heavy rain in central Zhejiang．