An experimental investigation and theoretical analysis were performed for the heat and mass transfer in the system of an adsorption heat pump cycle. The energy governing e-quation of the unsteady heat transfer in the adsorber was developed to simulate the pump cycle process. The simulated and experimental results were in good agreement. The heat transfer rate in the adsorber was proved to control the speed of the heat pump cycle. The structure of the metal fins inside the adsorber used to enhance heat transfer was simulated and studied. The theoretical model can be used to optimize the design of the adsorber.