By employing a numerical typhoon model with a threefold structure horizontally,experiments were conducted with terrain contained and without to investigate the impact of landing typhoon 9216 on the enhancement of its torrential rainfall.Results show that 1)the model involves in structure terrains at a range of scales with both the fine structure of the key sector and the effect of the large-scale ambient flow field considered so that the track and the distribution of strong wind and rainbelts can be better predicted; 2)orographic effect is responsible for the improvement on convective rainfall conditions,causing amplified rising at mid-to low-levels as com-pared to no-terrain run,with significantly intensified precipitation on the windward slope,in which convective rainfall accounts for a greater part.In contrast,no-terrain model results indicate that the typhoon is positioned northward,so are the easterly/westerly wind belts,and no expected substantial reduction occurs in vigor of the onland typhoon.It follows that the convergence due to orographic lifting contributes greatly to precipitation enhancement.