First we should ensure that the cotton must be dry, if the cotton containing moisture, cotton will be formed or bumps like. This kind of cotton is more difficult to fill to get perfect product. In general, this kind of cotton must be dried first. Then if the cotton is dirty, there is the phenomenon happen, alough cotton opening machine can card this kind of cotton, but the total cotton’s purity is certainly be affected. So in order to ensure the normal work of the cotton filling machine and the quality of filled product, we must ensure the quality of cotton, and keep the cotton clean and tidy.