A simulation experiment is conducted using the WRF model and the track and 24 h accumulative rainfall is successfully modeled, but the simulated central pressure of Saomai is much higher than that of the real situation. To study the orographic uplifting effect upon the rainstorm and the structure of typhoon Saomai(0608) during the landfall, a set of orographic sensitive experiments are further carried out by changing the terrain altitude within the selected area. It is concluded that during the landfall of Saomai, the orographic uplifting is able to enlarge the rainfall of the typhoon, and also to enhance the centre potential vorticity, vertical velocity as well as the convergence of moisture flux obviously. Meanwhile, the orographic uplifting peaks at the moment of typhoon Saomai's landfall.