Achyranthes bidentata is inclined to nourish liver and kidney and strengthen bones and muscles, while Achyranthes bidentata is inclined to promote blood circulation and remove blood stasis. Achyranthes bidentata is also called Achyranthes bidentata and grass-saving. It is the dry root of Achyranthes bidentata of Amaranthaceae. Its roots are slender and cylindrical, some are slightly curved, the upper end is slightly thicker and the lower end is thinner, and the diameter is between 0.4-1cm. The surface is grayish yellow or light brown, slightly twisted, with fine longitudinal wrinkles, long transverse lenticels and sparse fine root marks. Hard, brittle and easily broken, it becomes soft after being wet. The cross section is flat, yellow-brown, slightly horny and oily, the central vascular bundle is large and yellow-white, and there are many dotted vascular bundles scattered around it, arranged in 2-4 rounds. Slight gas, slightly sweet and slightly bitter. The quality of root length, fat meat, fine skin and yellow and white color is the best. Achyranthes bidentata is named after it is mainly produced in Sichuan. Achyranthes bidentata also has the names of Tianquan Chuanniu, Sweet Achyranthes bidentata, Beef Knee, etc. Among them, "Tianquan Achyranthes bidentata" is named because its medicinal materials are generally considered to be of the best quality produced in tianquan county, Sichuan, and "Sweet Achyranthes bidentata" is named because of its obvious sweetness. The dried Radix Cyathulae is also called the Achyranthes bidentata because some of it is twisted like a crutch. The commodities are divided into first, second and third specifications under the names of "special crutch", "race crutch" and "knee crutch". Cyathula in commercial medicinal materials is generally a long cylindrical shape with a diameter of about 0.5-3 cm. Its surface is yellow-brown or grayish-brown, with longitudinal wrinkles, root marks and most laterally protruding lenticels. It is tough and not easy to break, with a light yellow or yellow-brown cross section and dotted vascular bundles arranged in several concentric rings. The breath is slightly sweet.