In order to make a study of the kinematic and dynamic characteristics of convective cells,Doppler radar reflectivity factor data and radial velocity data are used to conduct radar echo extrapolation in this study.Therefore,the horizontal wind fields of eight different heights are retrieved by VAD(Velocity Azimuth Display) method and TREC(Tracking Radar Echoes by Correlation) method,which are taken as the motion vectors of echoes to get the extrapolated forecast of CAPPI(Constant Altitude Plan Position Indicating) reflectivity factor there.According to the methods of VAD and TREC,the radar echo extrapolation of two rainstorm processes have been carried out.The results indicate that the location of radar echoes during the next 60 min forecasted by the two methods coincides well with that from the observations.The extrapolation results of VAD and TREC are similar at some altitudes,and correspond well at the levels with the best results.The two extrapolation experiments show that the height levels with the best forecast results are related to the weather process,especially the vertical distribution of horizontal wind in the precipitation echo,which are not just limitted to 2.5—3.0 km.