Abstract: In order to improve the economic benefits of microgrids,it is necessary to fully consider the intermittent of new energy power generation and the high cost of hybrid energy storage system（HESS）. This paper presents a microgrid double-layer predictive energy management system（EMS）model based on price demand response. Considering the impact of price on demand response,based on the degradation cost of HESS depth of charge and service life. The long-term cost of battery and supercapacitor is modeled and converted into real-time short-term cost. Based on the price demand response,the upper layer of the double-layer EMS minimizes the total operating cost,and the lower layer reduces the impact caused by the fluctuation of prediction error and change of load power,so as to maintain system stability. The example analysis shows the effectiveness of two-layer EMS from two aspects:different prediction time range and prediction accuracy. When considering the price demand response,the supercapacitor can quickly stabilize the load power change which caused by price adjustment. Simultaneously,it reduces the average battery degradation cost and operation cost of the system and improves the economic benefits of the system.