Capillary tube, a efficient and energy conservation heat exchanger, has been widely used abroad. In china, the research of air-condition terminal based on capillary tube is focus on the planar radiation at the moment. But kinds of problems such as moisture condensation happen because of the different climate of China. So we put forward developing a kind of breathing air-condition cabinet combined with heat exchange and dehumidification, and do some calculation about major parameter. We will do in-depth study on cabinet's flow field so that it can be high-efficiency.