Air current type dryer is a type of industrial dryer employed to reduce or minimize the liquid moisture content of the material. The dryer is made up of a large, rotating cylindrical tube, usually supported by steel beams. Air current type dryer can be used to dry the following material: a. Sawdust, grazing, leaves, sugarcane biogases, and animals’ wastes and so on. And it can be used in Chemical Plant, Mine, Metallurgy and other industries. For example, the ore, the scoria, coal, metallic powder, phosphor fertilizer, sulfur. b. It can dry the granule materials which have special requesting and must dry in low temperature. For example, Vesicant; Light Calcium Carbonate; Active Dust; Magnet Powder; Plumbago and so on. During the Drying Process, the best moisture content to pellet and briquette is about 13-15% and 11-12%, the function of air current type dryer is to make the crushed pieces with suitable moisture.The Rotary Drum Dryer is made up of Direct or Indirect Biomass Stove, Main Rotary Drum Body, Screw Conveyor, Cyclones, Air-locks, Fans and matched Pipes which can realize to reduce the moisture from 60%-10%.