Abstract: Based on the experimental study on the air flowing field and the temperature field as well as drying uniformity of fully loaded material in the drying room of the chest-type two-direction flow heated air dryer for vegetables, a new phenomenon was discovered that the uniformity of the temperature and the drying effect of material in the drying room were almost the same as that of air flow in unloaded and unheated conditions. Furthermore, it is assured that this phenomenon can be applied to the research of the development of such dryer. It is an indirect measuring way for the temperature field and the drying uniformity of drying room.