Abstract: Integrated energy system is an effective way to achieve deep integration of multiple energy systems such as power grids, gas grids, and heating grids, and utilizes the advantages of energy coupling and interconnection to improve the energy utilization efficiency of the entire system. In order to improve the optimal operation capability of the integrated energy system, this paper firstly builds an overall model of the electricity-gas two-way coupling integrated energy system based on the power-to-gas technology and natural gas power generation technology. Furthermore, considering the characteristics of flexible and controllable topology in distribution network reconfiguration（DNR） technology, the objective function of introducing switch variables and the lowest total system operating cost in the distribution subsystem and the radial topology of the network with equal constraints, a reconfiguration model of the power distribution subsystem is established. From the perspective of reducing the complexity of solving the model, the original integrated energy distribution network reconfiguration non-convex nonlinear model is transformed into a mixed-integer second-order cone programming（MISOCP） through using the methods such as second-order cone relaxation, product variable linearization and piecewise linearization. The simulation results show that the application of power distribution network reconfiguration technology in the integrated energy system with electricity-gas two-way coupling can reduce the operating cost of the integrated energy system and effectively support the voltage of the power distribution subsystem and the air pressure of the gas distribution subsystem.