according to their characteristics and uses, sunflower seeds can be divided into three types: (1) edible type: large seeds, thick husk, low kernel yield, accounting for about 5%, and kernel oil content, generally 4% ~ 5%. The pericarp is mostly black and white. Suitable for fried food or feed. (2) Oil type: small grain, full kernel, thin husk, high kernel yield, accounting for about 65% ~ 75%, kernel oil content generally reaching 45% ~ 6%, and the peel is mostly black or gray stripes, which is suitable for oil extraction. (3) Intermediate type: The growth and economic characters of this type are between edible type and oil type.