This type silos are automatic-flow unloaded with quality cleaningsystem. They are widely used in storage of seeds, flour, feed, cement and chemistry, which need to be cleaned continually. With solid basic structure the conical- bottom has very strong strength .There are three kind of angles of 40 degree,45 degree and 60 degree, among which the angle of 60 degree conical-bottom is usually used to store larger pellet and powdered materials of high viscosity Features: It is famous for the automatic-flow unloading way, because it can save resources and costs. 1. Introduction of silo structure: (1) Silo bin: the silo wall is corrugated that is made of high quality galvanized board; the sheets are bolted together by common or standard bolts. The thickness of silo wall is designed comply with strength theory, which made the whole wall can afford the equalized tension. At the same time, the interior vertical stiffeners can afford vertical friction. It is 0.96m long between every two stiffeners, the cutting face is in the shape of “z”, and there are waterproof washers in the screw holes and waterproof rubber sealants between every two pieces of silo sheet. In order to make it easier to maintain and clean we take advantage of special silo doors, interior, exterior ladders, and ladder secure cages and so on. (2). Radial beam silo roof support system: the silo roof is made of galvanizing board that is 1mm thick, both battens and bolts are dealt with galvanizing coat. There are special secure equipments on the roof such as 4 sets of natural air roof vent, 1 manhole, roof ladders, and secure cages and so on. (3).The main parts on the silo and silo roof are all made of galvanizingboard & spares