Introduct: Wheat flour contains protein, starch, fat, vitamins and inorganic salts.The protein content of wheat flour is higher than that of other grain products, generally above 11% and up to 15%-20%. It is composed of glutenin and glutenin. After absorbing water, they can be knead into viscoelastic gluten, so wheat flour can be used to make food with unique quality and flavor.Wheat flour contains more than 70% carbohydrate and is mainly composed of starch, cellulose and other sugars. It is the main source of energy for human body.