With the further liberalization of power price control, enough attention should be paid to correctly dealing with the impact of market-oriented electricity price on the economy of integrated energy system. Taking a commercial complex in Beijing area as the research object, by analyzing the cold, heat and electric load characteristics of the energy consumption object, a suitable integrated energy system is put forward, and the physical and mathematical models are established. Combined with the current implementation of medium-and long-term power trading rules, the price signal formed by catalog price and market-oriented transaction price is used to evaluate the economy of the selected energy system. It is concluded that the implementation of an integrated energy system should fully take into account the regional energy supply structure and the possible market-oriented trading models and rules, and fully consider the possibility of large-scale fluctuations in the prices of final products or raw materials. The possible plan is put forward in the early stage of the design, minimize the ineffectiveness after the implementation of the integrated energy system.