According to the color and characters of leaf bulbs, Chinese cabbage can be divided into white cabbage, red cabbage and wrinkled cabbage, which is a multi-line Chinese cabbage. According to maturity, it can be divided into early-maturing species, middle-maturing species and late-maturing species. According to the shape of the valve ball, it can be divided into three types: flat head, round head and pointed head. Generally, there are many classifications according to this method. Flat-headed type: the plant is larger, the leaves are open, the leaves are oblate, the stele is shortened, the quality is good, the yield is high, and it is generally a late-maturing variety.