Abstract: Fritsch-Chappell’s one dimensional cloud model is introduced and incorporated into 11-layer primitive equation model. The convective parameterization scheme proposed by Kuo (1995) is also incorporated into the model used in this paper. The difference between the two schemes is compared each other in simulating a mesoscale convective process occurred over the Jianghuai area on 12 May 1982. The two numerical simulations indicate that this one dimensional cloud model is better than Kuo’s scheme. This investigation indicates that the mesoscale cyclone is the weather system occurred in planetary boundary layer. The interaction between mesoscale cyclone convection makes the cyclone develop. But in the early period of convection, the development of cyclone is limited by influencing of downdraft and cumulus momentum transport and mixing. When convection comes to depress, the mesoscale cyclone develops