The energy Internet can utilize a variety of energy sources comprehensively, optimize the scheduling with the redundancy of paths of energy transportation and improve the efficiency and economy. Based on the analysis of the operation mechanism and architecture design, four types of optimal scheduling model are expounded, including the basic model in the steady state, the transient model considering the energy difference, the unified model considering the energy similarity and the model considering the randomness of the system. And the application scenarios, modeling characteristics and solving methods of all kinds of optimization scheduling model are introduced.