In recent years

the penetration of natural gas power generation has been increasing and the rapid development of power to gas（P2G）technology also promotes the coupling between power system and natural gas system. In this paper

the multi-objective planning of integrated energy system of gas-electricity interconnection is studied

the coupling model of integrated energy system of gas-electricity interconnection is set up and the collaborative planning model of energy system of gas-electricity interconnection is proposed further. In this paper

multiple objectives are adopted to represent the reliability and economy of integrated energy system of gas-electricity interconnection. A multi-objective optimization model with the minimum investment cost

the most economic operation cost

the least energy shortage cost and the minimum compensation cost of demand side as the objectives is set up. In the case of solving the model

the method of weighting coefficient is used to transform the multi-objective planning into the single objective planning. The effectiveness of this gas-electricity interconnection energy system collaborative planning model in economy and reliability of integrated system is proved by the example.