With the market-oriented reform of Electric power market, Stakeholders are formed by power company,sales company and users. Studying the tripartite non-cooperative game model, a user-side response strategy based on the power supply reliability and the electricity price is presented, the electricity consumption plan and power suppliers can be flexibly changed. Based on price elasticity coefficient of electricity demand, Presented the electricity price optimization strategy for grid companies and distributed energy suppliers. It can guide all parties to cooperate with micro-girds scheduling, and reduce power fluctuations at the public connection point between the power grid and the micro-grids. The simulation results and experimental data verify the effectiveness of the proposed strategy.