Big-leaf rapeseed is one of two species of mustard-type rapeseed, and the other species is small-leaf rapeseed. Mustard-type rapeseed is commonly known as tall rapeseed, bitter rapeseed, spicy rapeseed, hemp rapeseed, smelly rapeseed or large rapeseed. It is mainly distributed in Xinjiang, Gansu, Qinghai, Sichuan, Yunnan, Guizhou and other provinces and autonomous regions, while in some southern provinces and autonomous regions, dryland cultivation is only sporadic. This type of plant type is taller and looser than the cabbage-type rapeseed, with slender branches and higher parts. The leaves are green or dark purple. The leaves on the upper part of the stem have short stalks, and the leaf base does not hug the stem. The stem leaves are lanceolate, with petiole, and the whole plant is densely or slightly covered with wax powder. The flowers are bright yellow, light yellow to pinkish white, and the petals are slightly longer. When they bloom, the petals separate and unfold into a rectangular shape. The flowers are small, the seeds are small, and they have a strong spicy flavor. The growth period is 200 to 220 days, and it matures in medium to late. Leaves fall early, and the stems become fibrous early and hard. The main root is strong, upright and does not fall over. It is suitable for intercropping and intercropping. Generally, it has characteristics such as drought resistance, cold resistance, disease and insect resistance, and barren resistance, and its yield is stable. Mustard (there are three types of mustard: leaf mustard, stem mustard and root mustard, and large-leaf mustard is a leaf mustard type.

There are also many excellent local varieties in various places, such as Xinjiang Aksu rape, Shaanxi Hanzhong high rapeseed, Sichuan Luzhou golden rapeseed, Guizhou Guiding bitter rapeseed, Jiangxi Jiujiang spicy rapeseed, Inner Mongolia Eroxtail rapeseed, Wuchuan large rapeseed, etc.