Cabbage can be divided into three basic ecotypes according to the shape and maturity of the bulb. First, the tip type: the tip of the bulb is sharp, which is similar to the heart shape, and most of them are early-maturing and early-middle-maturing varieties. It takes 5-7 days to plant the bulb to mature. Representative varieties are chicken heart cabbage, cattle heart blue and so on. 2. Round-headed type: the leaves are round, mostly early-maturing and early-middle-maturing varieties, and it takes 5-7 days from planting to harvesting, with few outer leaves and tight leaves. The representative varieties are Jin Zaosheng, Beijing Zaoshu, Shanxi No.1 and Jinmu 84. Third, the flat-headed type leaves are oblate, mostly medium-limited or late-maturing varieties, and it takes 7-1 days from planting to harvesting. The representative varieties are crew cut with black leaves, Huangmiao and Zhangjiakou fennel. The head-type bulblets are oblate, mostly medium-limited or late-maturing varieties, and it takes 7-1 days from planting to harvesting. The representative varieties are crew cut with black leaves, Huangmiao and Zhangjiakou fennel.