The stone column is beryl, the smell is extremely bitter, and it has the characteristics of branch fertilizer, thick meat, long strips, bright color and high effective ingredients. It is of great medical value. The products are gathered in clusters and curved like chicken feet, so it is commonly called "chicken claws". The surface of Coptis is grayish yellow or yellowish brown, rough and slightly lustrous, with irregular detail ridges and hairy residues. The branches have intermittent horizontal stripes, and the nodules are swollen, and the shape is like a bead.