Abstract: In this paper,the law of internal energy and the law of entropy which are in the open system are applied to the humid micro air-mass which can generate water phase changed by suffering external effect,deducing the equation of humid air-mass entropy production during vaporization and liquefaction process and the equation of heat transmit,which transmit heat energy from outside to the humid micro air-mass by heat conduction and radiation. A number of questions which are revealed by these two equations are discussed. It is pointed out that the heat energy can be divided into heat conduction energy and heat flow energy. The description of heating effect by latent heat and sensible heat is not proper.