Abstract: The uncertainty of renewable distributed energy sources（photovoltaic,etc.）and load demand in integrated energy systems pose challenges to the economics and safety of integrated energy system operation. A two-stage robust optimization model for an integrated energy system with P2G-CCHP is established,and a robust optimization model based on a min-max-min structure is proposed,which takes into account the uncertainties of photovoltaic and integrated demand response load schemes. The simulation results show that the P2G device improves the electrical-pneumatic coupling of the P2G-CCHP system,and improves the stability and economy of the system operation;the two-stage robust optimization model based on the C＆CG algorithm can obtain the scheduling with the lowest operating cost in the worst scenario scheme,thereby further reducing the operating cost of the system.