Abstract: As to hydropower output for standalone West Sichuan microgrid easily influenced by seasonal change, this paper proposes an integrated water-wind-PV-battery-dieselmicrogrid model.Firstly,the multi-source microgrid framework is given, and the Monte Carlo simulation is utilized to acquire the load power and the capacity of the distributed generation based on the modeling of such meteorological data as wind, light and water flow rate based on Homer software. Then an independent microgrid economic model is established by considering power supply reliability and environmental factor, as well as associating with the cooperation of water and wind power constraints. In the end, the model is solved by advanced PSO realized by MATLAB simulation tool, and the optimal power supply capacity combination can be selected.The results show that the proposed model can ensure the reliability of power supply and achieve economic optimization.