In order to improve the continuity， reliability and economy of hybrid renewable energy system， this dissertation based on the numerical simulation of Matlab software pro-posed a method to calculate the configuration optimization of the hybrid Wind-PV-Battery-Diesel system by using the genetic algorithm method.This method established the power model， cost model and reliability model of the system， meanwhile it set the minimum total lifecycle costas the constrain to find the optimization scale of each component in the sys-tem.The results of simulation indicated that this model can effectively find the component optimization of the system， and it can be based on the different requirements of the design to obtain the different optimization results which may give more choices for the decision maker.