Abstract: Aiming at the problems of poor comfort and high energy consumption caused by the combined treatment of temperature and humidity in the traditional air conditioning system,a liquid desiccant dehumidification air conditioning system driven by the combined utilization of solar energy and geothermal energy is established with its mathematical model by using TRNSYS simulation software,taking a building in Nanchang as the research object,and the effects of collector area and buried pipe number on the system are analyzed. On this basis,appropriate parameters are selected to simulate the annual operating conditions of the system. At the same time,aiming at the problem of great fluctuation in moisture content of outdoor fresh air in summer,a solution of shunting fresh air is put forward. The results show that the average indoor temperature is about 26.1 ℃ and the relative humidity is between 50%-65%;Under the condition of heating,the indoor average temperature is about 19.2 ℃ with the relative humidity of mostly between 40%-60%,which shows the indoor hot and humid environment are well controlled. The energy efficiency ratio in heating season and in refrigeration season are 6.2 and 4.5,respectively and the annual performance coefficient is 4.7,which are significantly higher than the traditional air conditioning system.