Power to gas and power to heat are significant to renewable energy accommodation and shift peaks and fill the valley.The research on the economics of applying it to the integrated energy system of the park plays an important role in the promotion and application on the demand side. Firstly, a mathematical model of the key devices in the system is established. Then a system optimization operation model, aiming at the lowest system operating cost, with energy balance, equipment operation, and power exchange with the grid as constraints is established. Finally, the model is solved by the mixed integer linear programming method. The example shows that compared with the separated production system and the operation strategy of FED and FTD, the integrated energy system of the park with power to gas and power to heat is more economical and operational strategy is better. Power to gas and power to heat devices also can effectively utilize the electricity in the power system valley load period, and has a strong ability to shift peaks and fill the valley.