Growing with the development of the county micro grid scale, there is a micro network operating expenses cost and distributed renewable energy cannot be given rate at the same time and optimal problem, a day operators spending cost minimum and maximum double objective function of photovoltaic given rate are established, and power balance, power range and other constraints, micro grid optimal operation model are established. The multi- objective particle swarm optimization is introduced to solve the two-objective problem. Finally, taking the predicted data of total electricity load and PV of an industrial park as an example, the results are compared with the optimization results of standard particle swarm optimation under single objective to verify the effectiveness of the proposed model and algorithm.