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Traditional condensing air-conditioning systems consume large amounts of energy in hot and humid areas,and it is difficult to achieve simultaneous control of temperature and humidity.A combined absorption refrigeration (AR) and liquid desiccant dehumidification (LDD) air-conditioning system based on cascade utilization of low-grade heat source is proposed.The system can realize independent control of temperature and humidity and carry out profound recovery of low-grade heat sources.Under the design conditions,the heat utilization rate ξreaches 21.05％,which is 2.73 times that of the conventional absorption refrigeration reference system.A parametric sensitivity analysis is performed to optimize the system.The ξ increases from 9.79％ to 18.55％ and the coefficient of performance COPt increases from 0.33 to 0.35 with an increase in chilled water temperature from 7℃ to 15℃.With an increase in regenerant solution temperature from 60℃ to 70℃,the ξ achieves the optimal value of 21.05％ at 68℃.ξ decreases from 21.05％ to 15.05％ as the concentration of the regenerant solution increases from 36％ to 40％.Under variable environmental temperature and humidity,the ξ of the proposed system changes within a small range and stays much higher than that of the reference system with the same quality heat source,which indicates that the proposed system has a better adaptability to changing environmental parameters.