Abstract:Based on the NCEP/NCAR TRMM,FNL and reanalysis data,the mesoscale numerical model WRFV3.2 is used to simulate the Meiyu front rainstorm over the Huaihe River basin during 23—24 June 2011.A series of sensitive experiments are carried out to research the effect of the terrain of Dabie mountains on the rainstorm.Results show as follows:1)The terrain of Dabie mountains can force the southwest warm-wet flow to uplift and flow around the mountains,which produces perturbation and is conducive to release unstable energy,condense water vapor,and form rain band.2)Due to the terrain of Dabie mountains,the warm-wet flow meets the north air stream,the troughs exhibit zonal distribution,and the rain band is consistent with the flow convergence band.3)If the terrain of Dabie mountains increases,the convection would be more severe.If the terrain of Dabie mountains decreases or disappeares,the rainfall center at Huaihe River basin would shift eastward apparently.Therefore,the terrain of Dabie mountains can weaken the eastward movement of synoptic system,and concentrate the heavy rainfall.