Considering the advantages of integrated energy systems（IES）in economy and energy saving, and the important role of hydrogen storage and electric heat storage systems in power peaking, An IES for parks that includes hydrogen storage and electric heat storage systems is designed, and the capacity configuration method and optimal dispatch strategy are proposed. Firstly, the basic architecture of the system is established, and the mathematical model is established for the key equipment. Then establish a system optimization design model, in which the minimum system integrated energy cost is the optimization target. Finally, the optimization design model is solved by the bi-level solution combining particle swarm optimization（PSO）and Gurobi. Simulation results indicated that the IES designed with the proposed method can plan electricity, hydrogen, cooling and heating together to allocate resources rationally. Compared with the original energy supply system in the park, IES can reduce the energy cost of electricity, heating and cooling, improve the economics of the system,and have the potential to be promoted on the demand side. The hydrogen storage and electric heat storage system can effectively utilize the electricity in the power system valley load period, and has a strong ability to shift peaks and fill the valley.