Earthworm, also known as earthworm, is one of the important Chinese herbal medicines. Among the 67 kinds of animal medicines recorded in Shennong Materia Medica, the earliest monograph of traditional Chinese medicine, earthworm has the functions of clearing away heat, relieving convulsion, dredging collaterals, relieving asthma and diuresis. Often decocted, it can be used for high fever, coma, convulsion, joint pain, cough due to lung heat, oliguria and edema, hypertension, etc.

Land dragon: It is a curved cylinder, with a length of 5 ~ 10 cm and a diameter of 3 ~ 7 mm Its whole body is composed of many links, and its abdomen is not cut open. The mouth is at the tip and the anus is open at the blunt end. The genital zone is not obvious, the body surface is grayish brown, and dirt is often attached. The quality is easily broken and easily broken, and the section is earthy. The smell is fishy and slightly salty.