Abstract: At present, with the increasing penetration of new energy in the grid, it has a significant impact on the peak regulation and frequency modulation, reactive power compensation and other aspects of the grid. The peak regulation balance of energy storage station is one of the basic problems for the safe and stable operation of the grid. In this paper, based on the operation data accumulation of the grid-side energy storage station, analyzing the characteristics of energy storage and new energy, and making use of the bidirectional power characteristics and flexible regulation ability of the energy storage system. Actively studying on optimization strategy for peak and valley filling of the county grid-side energy storage, based on MATLAB simulation platform, establishing new energy and energy storage optimization scheduling model, and putting forward the evaluation index system for energy storage, analysing on the optimal operation model through the simulation, showing that the proposed scheduling model can give full play to the comprehensive benefit of energy storage, Effectively relieving the pressure by new energy peak back regulation, and improving the controllability and penetration of new energy power generation such as wind power and photovoltaic power.