Based on system thermal COP and Cooling Capacity (CC) analysis, simulation work is carried out for possible application of solid desiccant cooing system in combined heating, cooling and power system (CHCP). With varied environmental air condition and supplied heat source temperature, the performances of high efficiency desiccant cooling system are calculated compared with traditional absorption cooling unit which is mostly applied in CHCP system currently. The results show it is possible and better for such a system to be used in CHCP system under moderate humid climate.