Abstract: The optimal allocation of integrated energy system directly affects the efficiency of investment and operation, which is one of the keys of integrated energy system planning. This paper analyzed the main internal and external factors affecting the planning for the park level comprehensive energy system. On the basis, an optimal allocation method with the equivalent annual cost of the whole life cycle of the park's comprehensive energy system as the target was proposed, and an energy station in a park in south China was taken as an example to optimize the allocation of the system. Through the comparative analysis of different energy supply design schemes, a reasonable optimal allocation scheme was proposed to provide technical support for the planning of the park's integrated energy system.