In many cases, industrial air compressor compress air from 1 KG to 7KG, the compressed air condense water from the air and practical could have very shocking effect to the final product and instrumental equipment. What the air dryer do is to protect valves, instrumental piping, and meters, using different kind of technologies such as Desiccant type air dryer, Refrigeration type dryers, Hybrid dryers employing both a refrigeration type dryer and a heatless desiccant dryer. With the above technologies, we could produce good and purifying air with minimum energy consumption.