According to the grain morphological structure, corn can be divided into 9 types: hard grain type, horse tooth type, farinaceous type, sweet type, sweet powder type, burst type, waxy type, barnyard grass type and semi-horse tooth type. According to the maturity classification, it can be divided into three types: early, middle and late.
According to the use and grain composition, it can be divided into two categories: special corn and ordinary corn.