Abstract: In order to further optimize the pump station multi-unit combined operation mode and to reduce the pump station energy consumption,a dispatching model is established to minimize the daily power consumption of the pump station in our study. Aiming at the local convergence problem of genetic algorithm,a nonlinear fitness function based on genetic individual order is designed from the perspective of improved fitness function of genetic algorithm. Through the practical application in pumping stations,it is found that the improved fitness genetic algorithm（FFGA）is obviously better than the traditional genetic algorithm SGA in algorithm stability. The daily power consumption of optimal dispatching scheme of pumping stations by using the FFGA method is 1.77% and 8.07% lower than the SGA method and the practical method,respectively. The results can be useful to practical engineering.