China leads the world cultivated area and annual output of walnuts. Except for eating directly,walnuts are mainly used for oil extraction. Defatted walnut flour is the by-product of walnut oil process.The protein solubility of defatted walnut flour is very poor and the color is brown. Defatted walnut flourcannot be used in food product and can only be used as feed with low added value, because there is nopeering process before oil extraction. The composition, amino acid and protein fraction wereinvestigated...