In terms of the excessively designed pumping house by the method in current standard, an optimized model for the pumping house of a wet-pit type was proposed. The main dimensions of the pumping house are selected as design variables, while the minimum construction cost of the pumping house is the objective function. The stress of basement, the bearing capacity of foundation, the stability of sliding, the strength and the settlement of pumping house are the primary and constrained conditions. Then, the parameterization finite element model of the pumping house was established. An optimal scheme of the pumping house was obtained by utilizing the optimization platform of ANSYS. Compared to the original scheme, the optimized design shows a decrease of 9. 7% in the cost of the pumping house. Other results including the displacement, stress, and stability were all satisfactory. It indicates that the effect of optimization is noticeable and the economic benefits are also remarkable.