Cottonseed husk is the seed coat of downed cottonseed, which is the offcuts of oilseed processing plants. Cottonseed shells account for 32-40% of the total weight of cottonseed, China's annual output of about 12 million tons of cottonseed shells, the vast majority of which are used for edible fungi production, according to research, cottonseed shells are not only rich in nutrients, and the texture of the loose, absorbent, with good physical properties, add water to soak through or when adding pressure, does not slate, permeability is good, containing a certain amount of air to provide the mycelial growth of the oxygen needed, is suitable for mushroom cultivation of the most desirable It is the most ideal raw material for mushroom cultivation. There are many kinds of cottonseed shells, including coarse shells, medium-coarse shells, fine shells, more and less fluff, and more or less cottonseed kernels. Generally coarse shells, down less shells, kernel less shells better than fine shells, down more shells, kernel more shells. But the fine shell, down more, kernel more shell yield is higher than the coarse shell, down less, kernel less shell: suggested that the user should use both, flexibility