With the new generation numerical prediction model GRAPES (Global/Regional Assimilation and Prediction Enhanced System),three typical heavy rainfall events happening respectively in Guizhou Province during June 23?4,July 17?8 and 21?2 of 2004 are numerically simulated,and the result is compared with observation data.The result shows: In all these processes,the movement of the major weather system is simulated by GRAPES model successfully,such as the strengthening of southwest vortex,low level jet,the conver-gence of low level jet and the passage of upper trough.GRAPES model can successfully sim-ulate the distribution of precipitation.But unfortunately,there are some differences in heavy rainfall between the observations and simulations.The simulation values of the precipitation center less than the observations.From the numerical results, GRAPES model is proved to have good ability to simulate heavy rainfall in Guizhou,and to be of good reference.