Electricity, gas, heat and other energy sources are coupled in the micro-energy network, and the coordination optimization of capacity and operation of micro-energy grid is the key to to promote the absorption of renewable energy and improve energy efficiency. Aiming at the problem of optimal allocation of micro-energy network with CCHP, the system architecture and energy flow of micro-energy network with electricity, electricity input and electricity and heat output coupling are firstly analyzed, operational strategies to promote renewable energy consumption and improve energy utilization are proposed, and heat supply reliability index based on energy flow is established, then, the micro-energy grid system capacity and the operation strategy system optimal allocation model is established, considering the comprehensive evaluation index of investment cost, primary energy consumption, carbon dioxide emission and energy supply reliability. The simulation results show that the model can promote the consumption of renewable energy and improve the economy of the system while ensuring the reliability of energy supply.