There is a function which adjusts the temperature of the air which enters into internal in the nasal cavity. The authors using the nasal cavity form which was re-constructed so far from the CT picture, heat of the air and cooling function was made clear with constancy analysis. But, breath of the human was non constancy, in addition, behavior of the flow in expiration, circumstance of heat was thought by the temperature of the air which flows that it changes. In this report, the non stationary analysis which designates the nasal cavity wall as an isothermal condition is done, the temperature distribution with heating and cooling the air which flows is made clear.