Abstract: On the basis of the remarkable advantages of coordinated application of gas turbine and P2G to the improvement of energy cascade utilization rate and the reduction of polluted gas,the regional electric-gas interconnected integrated energy system（ RIEGS）has emerged as the times require becoming a new direction for the development of regional energy efficient utilization. Firstly,based on the unique time delay characteristics of gas energy compared with electric energy transmission,it expounds the operation mode of RIEGS system with natural gas pipeline network. Then,the working model and principle of RIEGS core equipment P2G in the system are introduced. From the demand response in the RIEGS system,based on the application of power demand response（ DR） in common microgrid system,it sums up after the DR in the expansion for integrated demand response（ IDR） for electricity,gas and heat,the influence on RIEGS energy storage configuration and economic scheduling and its improved application. Finally,The new technology application and market mechanism reform of RIEGS in the future are prospected.