Starch is white and light yellow powder. The grain is soaked in 0.3% sulphurous acid and then crushed, sieved, precipitated, dried and ground. Ordinary products contain a small amount of fat and protein, strong moisture absorption, up to 30%. Starch sugar industry uses starch to produce high maltose syrup, fructose syrup, maltodextrin, etc. Starch is used in modified starch industry, and its modified starch is widely used in papermaking, chemical industry and other industries. Starch is used in fermentation industry to produce monosodium glutamate, citric acid and many other products. Starch is also widely used in metallurgy, casting and other industries.