the present invention relates to an absorptive heat pump circulation systems and heating method . according to the present invention , an absorption heat pump circulation system comprises : a generator , equipped with a heat exchanger ; an evaporator , equipped with a driving heat source ; an absorber , equipped with a heat exchanger ; and an absorbent crystallizer . an absorption solution entrance of the crystallizer is connected to an absorption solution exit of the absorber and a crystallized absorption solution exit of the crystallizer is connected to an absorption solution entrance of the generator , and a crystal output of the crystallizer is connected to an absorption solution entrance of the absorber ; the heat exchanger of the generator and the heat exchanger of the absorber are connected to form a thermal cycling loop , which transfers the absorption heat generated by the absorber to the generator . since the absorbent crystallizer is provided , and the heat generated by the absorber is provided to the generator directly through the thermal cycling loop , then the external driving heat source required by the generator in the traditional absorption heating circulation system is essentially saved , so that the coefficient of performance is significantly improved . the present invention extensively applies to the utilization of excess heat at a low temperature as well as energy - saving and emission - reducing in the fields such as chemical industry , food industry , sewage treatment , sea water desalination and so on .