In order to increase the accuracy of flood estimation， take full advantage of flood water resources， and relieve the flood pressure in thedownstream of the Zhexi River， a suitable flood simulation model is needed to provide science and reasonable references for reservoir flood control.This paper studied the application of the Xin'anjiang model and Tank model in this basin. The multi-objective optimal algorithm of Multi-Objective Shuffled Complex Differential Evolution （MOSCDE） was used to calibrate the model parameters of these two hydrology models. The resultsindicate that the two models work well at rainfall-runoff process simulation， especially for high flow flood events. The results also show thatthe Xin’anjiang model slightly outperforms than Tank model in flood peak as well they are similar to perform well at flood volume and the hydrographof flood.