中文摘要：

MM5模式中有多种积云参数化方案可供选择，粗细网格采用不同的积云参数化方案对降水预报有一定的影响。采用常用的四种积云参数化方案，粗细网格进行不同配置，对辽东半岛大暴雨过程进行试验发现：细网格信息可以通过嵌套边界向外层传递，影响外层预报结果。细网格选取GR方案比选取AK、BM、KF方案模拟效果好很多；细网格参数化方案不变，粗网格取不同的参数化方案，对细网格的模拟结果差别不大。但选取一个好的参数化方案对细网格的模拟结果会稍有改进。

英文摘要：

There are a number of cumulus parameterization schemes（CPSs） to choose from in the mesoscale numerical model MM5. The difference in CPSs for coarse and fine meshes will influence the precipitation forecast. This study adopts four common CPSs and different allocations of coarse meshes and fine meshes to simulate a heavy rainstorm process on Liao Dong Peninsula. The following points have been summarized. The information in the fine mesh can be transferred to outer layers across the nested boundary so as to affect the forecast results. If the GR scheme is used for the fine mesh, better simulation can be achieved than with the AK, BM or KF schemes. With parameterization scheme remaining unchanged in the fine mesh, its simulated results do not vary much with different parameterization schemes used in the coarse mesh. However, a good scheme will slightly improve the simulated results of the fine mesh.