The cassava chips dryer from Gongyi Lantian Machanical Plant is a kind of box dryer, which can be disassembly. It is using electric as power and through heater to heat. The large quantity of hot air circulate in the charmber to increase the inside temperature, and also send the moisture out. We produce different sized cassava chips drying machines, equipped with low noise, high temperature resistance fan and automatic temperature controlling system. The entire circulatory system is closed and make the drying efficiency improved from 3-7% to 35-40%, and the highest thermal efficiency can reach 70%.