Abstract: Cyclic durability of an open adsorption heat pump system to generate high temperature steam using low-grade hot water and gas was experimentally tested. A 13X zeolite-water working pair was used, and 320 g zeolite was filled in the reactor. Superheated steam of 191~264℃ was generated from the system with input water of 80℃ and dry air of 130℃. The results show that the steam to input water mass ratio is 14.5%, and the steam generation rate is 4.87×10^-5 kg(s)·kg(z)^-1·s^-1. The first cycle of a 15-cycle test shows the highest steam temperature of 264℃ and the temperature lift is 156℃, with COP_h(coefficient of performance for heating) and COP_ex(exergy efficiency of performance) of 0.43 and 0.54, respectively. This is due to the lowest initial water content in zeolite and the highest integral adsorption heat. The subsequent 14 cycles show steady performance with gross temperature lift of 94±3℃, COP_h of 0.31~0.33 and COP_ex of 0.35~0.37. It can be concluded that the nano-scale pores inside zeolite particles keeps functional under high temperature and high humidity conditions. Water adsorption ability of the zeolite remains stable with good durability.