Abstract:A simulation experiment was conducted using the WRFV3.0 model about Jiang-Huai cyclones from 00:00 UTC April 19 to 00:00 UTC April 22, 2009. A sensitive experiment was carried out by changing marine attribution into land attribution in the researching area to discuss the impact on the track and the intensity of Jiang-Huai cyclones.The results indicated that, when marine attribution changed into land one,JiangHuai cyclone track was deviated to the southeast compared with the real situation, and the deviation became relatively larger on the sea; cyclone intensity increased slightly in the Dabieshan area and weakened subsequently on the sea. All factors, such as water vapor convergent zone, strong convective available potential energy in the front of the cyclone, the latent energy in the center of the cyclone and south airflow in the south of the cyclone's center, were conducive for the development of Jiang-Huai cyclones.