By using the mesoscale numerical model of WRF,this study compared and analysed Morrison and Milbrandt-Yau two-moment microphysical schemes by using them to numerically simulate a heavy rainfall in Liaoning Province on July 20-21,2010.The purpose was to compare their simulation capability and difference in microphysical process by analysing surface cumulative precipitation,rainfall intensity and raindrop cloud microphysical quantity.The results showed that in terms of the simulation capability of rain belt location and the number of strong precipitation centers,Morrison performed better than Milbrandt-Yau scheme.However,in terms of the simulation capability of the center of heavy rainfall intensity,Milbrandt-Yau scheme was superior to Morrison.Their diffiences in macro characteristics of strong precipitation reflected,to some extent,the differences in microphysical characteristics they described.Compared with MY scheme,MOR scheme simulated a higher vertical water vapor flux than that of MY scheme,which enhanced the snow sublimation growth and touch growth.It brought the high content of snow and the low content of ice crystals in MOR scheme,which produced a large amount of graupel through rime attachment of ice ctystals.The attachment process consumed much could water and made the cloud droplets(cold water) decrease.The raindrop diameter remained 1mm from 600 hPa to the surface in Morrison scheme,which was obviously inconsistent with the reality.So it needs further improvement.