Abstract: Herein,we addressed the vacuum evaporation of LiCl solution in air-conditioner with independent controller of temperature and humidity.The influence of the temperature difference in heat transfer,flask-shape,pressure and self-defined Equivalent Thickness(ET) on the evaporation of LiCl solution was investigated.The results show that the flask-shape,pressure and temperature difference all had a major impact.For example,a lower pressure evaporated more LiCl solution; for a spherical flask,as ET increased,the evaporation of LiCl solution decreased(~3 kPa) and changed in an increase-decrease mode(6~10 kPa),but for a conical flask,the evaporation decreased(<10 kPa) and changed in increase-decrease manner(>14 kPa).As the temperature difference increased,the evaporation of LiCl solution increased in spherical and conical flasks; however,cross-overs of evaporation curves(below 8 kPa) occurred for a spherical flask only.When it comes to vacuum evaporation,conical flask may outperform spherical flask.