To make use of resources in a reasonable and effective way, the energies of users should be optimized and managed. In this paper, an interactive optimized energy management method is proposed for integrated energy system in the commercial area. Model is established in accordance with typical configuration of internal combustion engine, the configuration includes gas engine, waste heat recovery device, cooling load peak modulation device and hot water preparation device. According to the different seasonal demand for energy, three modes are put forward, which are centralized cooling operation, centralized heating operation and transition season operation. and the optimization objectives and constraints of three kinds of operation mode are established. Through a typical case, the optimal output curves under different operation mode of each unit are obtained to achieve energy optimization scheduling.