Model verification is a very complex job when modeling the groundwater. The complexity is cause by the choice of optimization method, the abnormal parameter peak because of attention to equilibrium and the mass computing time for optimization and so on. In this paper, the hydrogeological model in the whole area is divided into subdomain model based on the idea of DDM when the target function is calculated. The example is applied on the Dual-core computer and the results show that this method for searching the hydrogeologic parameter has high reliability. This step not only reduces the computing time, but also improves the fitness. The method is also applied to the inverse simulation of a water source area in Shandong Province. It is successful to solve the inverse simulation of hydrogeological model according to the results.