The annual cereal plant of Poaceae maydeae, whose scientific name is Zea mays, originated north, central South America. The plant is tall the stem is strong straight. Stems narrower on both sides, undulate. Hermaphrodite, male flower inflorescence spike like terminal. The female flower spikes are axillary, mature into a panicle, with a thick axis, the spikelets are arranged in pairs to form two rows of grains. The ear is surrounded by many layers of abnormal leaves, called foreskin. The seeds are edible. There are 10 pairs of chromosomes in somatic cells of diploid maize. Therefore, the number of columns of corn is usually even. According to the grain texture, the commercial grade can be divided into horse tooth seed, hard seed, powdery seed, popcorn, waxy corn sweet corn. The depression at the top of grain is caused by the difference of dryness between hard starch soft starch. Hard corn contains less soft starch, the top is sunken after drying. Powdery corn mainly contains soft starch, which is powdery easy to crush. Sweet corn wrinkled, transparent, sugar does convert into starch. Popcorn is the extreme type of hard corn. Its grain is small hard, does contain soft starch. When heated, the water in the cell expands the grain bursts. The type of maize can be improved by crossing excellent inbred lines. Corn is used as feed, food industrial raw material. It is the main food in many areas, but its nutritional value is lower than that of other cereals, its protein content is also low, it is lack of nicotinic acid. Corn is suitable for bread because of its low gluten content. In Latin America, corn is widely used as unfermented tortillas. In fact, although the nutritional value of corn is lower than other cereals, Isomaltooligosaccharide can be put forward in corn. Isomaltooligosaccharide is the most excellent prebiotics. Prebiotics are the food of probiotics, which has a close relationship with the reproduction of probiotics in human body, so as to achieve a balanced state of intestinal flora make the intestinal tract healthy.