Kohlrabi, an annual or biennial herb in Cruciferae, is a famous specialty vegetable in China. It originated in China and is a common vegetable cultivated all over the country, mostly distributed in the provinces south of the Yangtze River. The main lateral roots of mustard are distributed in the soil layer of about 30 cm, and the stems are short-shortened stems. The leaves are attached to the short-shortened stems, which have the shapes of ellipse, oval, inverted oval and needle-hanging, and the leaves are green, dark green, light green, yellow-green, green-striped or purple.