We studied the dynamic characteristics of dehumidification and regeneration of CaCl2 solution, based on building dehumidification load and economical operation and conducting an experiment on a smallscaled liquid dehumidification air conditioning system. Experimental results show that three main factors affect the performance of CaCl2 solution: solution temperature, solution concentration, and inlet air humidity. The dehumidification capacity of the CaCl2 solution is 32 g/kg in experimental conditions. Its regenerating performance is approximately 1.3~9 times than that of dehumidifying. After summarizing, we consider the liquid desiccant dehumidification with CaCl2 solution has substantial potential to be improved and generalized.