Bitter Bean Seed is a plant belonging to the legume family with the scientific name Sophora alopecuroides L.. It is an herb or basally woody into a subshrubby plant that can grow up to 1 meter tall. The leaves of Sophora alopecuroides are pinnately compound, with subulate stipules, opposite or nearly alternate leaflets, lanceolate-oblong or elliptic-oblong in shape, and obscure lateral veins. Its flowers grow at the top of the raceme, the flowers are numerous and crowded, the corolla is often white or yellowish, the flag petals are variable in shape, the wing petals are often unilateral, the keel petals are similar to the wing petals, the pods are in the form of a string of beads, and the seeds are slightly flattened in the shape of an ovoid. The flowering period of the bitter pea is May-June, and the fruit ripening period is August-October. Bitter pea seed is mainly distributed in Inner Mongolia, Shanxi, Shaanxi, Ningxia, Gansu, Qinghai, Xinjiang, Henan and Tibet in China. It is also distributed in Russia, Afghanistan, Iran, Turkey, Pakistan and northern India. It mostly grows in arid deserts and grassland fringes, and is characterized by drought tolerance and alkalinity tolerance. Bitter bean seeds grow rapidly, adaptable, common in the Yellow River basin and other regions.