The GCE(Goddard Cumulus Ensemble) model shows the interactions of clouds with each other,with their surroundings,with long wave radiative transfer processes,and with trace gas distributions.On one hand,the model can explain the growth,mature and decay processes(life cycle) of clouds by the cloud microphysical quantities,such as the hydrometeor change,etc.;on the other hand,based on the cloud microphysical processes,it can also be used to analyze rainfall process by introducing surface rainfall equation.Therefore,the precipitation processes actually reflect of cloud development processes.The cloud-resolving model discussed in this paper is the two-dimensional version of the Goddard Cumulus Ensemble Model.Based on the model,a heavy rainfall event in South China from 10 to 15 June 2008 is simulated.The characteristics of water vapor budgets and heat budgets are analyzed in the different phases of major surface rainfall period.Results show that the rainfall process is mainly repressed by local atmospheric moistening and water vapor convergence decreasing during the onset phase,while the local water vapor change,water vapor convergence,surface evaporation,and local hydrometeor change make positive contributions to the rainfall process during the mature phase,which leads to a maximum rain rate.In the decay phase,the major reason for the small rain rate is that the water vapor convergence is reduced significantly.In raining stratiform regions,the main water vapor source is water vapor convergence,while the main water vapor sink is local water vapor increasing.In convective regions,the main water vapor source is water vapor convergence and local atmospheric drying,while the main water vapor sink is local hydrometeor gain and transportation of hydrometeor from convective regions to raining stratiform regions.The local atmosphere heat change is small during the onset and decay phases,but during the mature phase,the local atmosphere cooling reaches the maximum.Time and domain means of the heat divergence and the latent heat release are the main reasons to cause the local atmospheric cooling.