The structure is simple and easy to operate and maintain, the dehydration process is fast so that it can avoid falling pulping or forming lump when forming pulp on the arc type stock-stirring plate,and it can improve the working speed.Because of fast dehydration formation, it shortens the molding area, reduces the carding and cleaning effect of cylinder mould, and it improves the uniformity of the paper,reduces the energy loss in the process of pulp transportation, saves the electricity.