The surface of ootheca mantidis is biological phosphorus powder. It is produced by body secretions on the surface, giving the impression that the surface is coated with a layer of powder. Ootheca mantidis is the dried egg sheath of mantis, knife mantis or axe mantis. Ootheca mantidis tastes sweet and salty, and its medicinal properties are peaceful. Enter the liver and kidney meridians. The main components of ootheca mantidis are protein, phospholipids, amino acids, sugar, fat and so on. Among them, protein, phospholipids and amino acids are the main active components.