Buildings are characterized by clusters. Through the interaction of buildings and optimization of energy equipment,the energy efficiency can be further improved and the environmental pollution would be much reduced. Firstly, a typical energy inter-connected building is constructed, and a multi-building joint operation structure is proposed. Then, the cooling load demand mode land electric vehicle model are mainly discussed. The room temperature is optimized by appropriate temperature limits and temperature penalties. Taking the total operating cost of the whole building group as the optimization objective, a multi-building combined optimal scheduling model considering the power interaction between buildings is proposed. The simulation of building independent operation is set up to enhance the persuasiveness. The economic cost of the two operation modes is compared through a calculation example. The influence of electric vehicle and cooling load requirements on the system operation is analyzed. The results show that the electric vehicle and cold load can affect the building micro-source out-put and the economy, which can further improve the utilization of renewable energy and reduce system operating costs.