A suitable high-temperature steam heat pump system based on multi-objective optimization is designed to save energy and reduce emission. Firstly, The calculation method of Exergic efficiency of high temperature steam heat pump was proposed after the explanation of each subsystem, the study of system mechanism and establishment of the system’s static model. Then, the optimization parameters and optimization indexes of the system structural parameter optimization were determined. Exergic efficiency and all cost were taken as the optimization objective, and the multi-objective artificial bee colony algorithm (MOABC) was used to establish the multi-objective optimization model of high-temperature steam heat pump. Finally, MOABC was optimized for exergic loss and COP of the system under different working conditions. Experiments show that exergic efficiency as energy efficiency index can improve the energy quality of high temperature steam heat pump system. Using COP as the energy efficiency index can reduce the energy consumption of the system