WRF (Advanced Weather Research and Forecasting modeling system) was used to simulate the local heavy rainstorm process caused by super typhoon Wipha over the eastern coast of Zhejiang Province from 17 to 19 September 2007. The analysis of the simulation result combined with Doppler radar data, TBB (Temperature of Black Body) data, and NCEP (National Centers for Environmental Prediction) reanalysis data shows that the rainstorm was due to the intrusion of north cold－dry current from the upper-level trough into the typhoon circulation. The warm－moist peripheral southeastern jet from typhoon Wipha brought rich moisture and heat, and the north cold－dry current provided kinetic condition and instability energy for precipitation. The distribution of rainfall and circulation of typhoon Wipha showed clear asymmetric structure during the landing period. The rainfall and convection activity mainly occurred in the west quadrant of typhoon. The east part of typhoon circulation was warm and moist while the west part was cold and dry. The energy front contributed by the convergence of cold and warm air in the coast area of Zhejiang Province was the most active convective region, also the main precipitation zone. There were several small scale convective cloud cells lining from north to south along the energy front in the low troposphere, together forming a mesoscale spiral rainband. As the typhoon moved northwestward, the north cold－dry current further intruded into the warm－moist circulations. There were new-born convective cells at the down edge of the rainband. The strong vertical shear of wind along the energy front offered advantageous environment to the development and maintenance of the convective cells. The cold－dry current invaded into low level and imbedded into the bottom of the warm－moist circulations along the energy front, which, together with the beneficial topography, lifted the warm－moist air up forcefully and triggered convection weather.