Hai Tong Pi has the effect of killing insects and relieving itching, relaxing tendons and collaterals, dispelling wind and removing dampness (dispelling wind and dampness in the body), and can be used in the treatment of paralysis, scabies and ringworm and other diseases. Hai Tong Pi is used in the drying of the bark of the plant Prunus serrulata, which is pungent, bitter, and flat in nature, and can enter the liver meridian. It has the efficacy of killing worms and relieving itching, relaxing the tendons and collaterals, and dispelling wind and removing dampness, and can be used in the treatment of paralysis of rheumatism and wind-dampness, and the pain in the lower back and knees due to the downward injection of damp-heat (damp-heat evils encroaching upon the intestines, the bladder, the pubic region, and the lower limbs, etc), eczema and scabies and other symptoms. Hai Tong Pi can be decocted and taken internally, or decocted and washed externally or powdered and applied. Contraindications and adverse reactions of the drug is not clear, blood deficiency should not be taken, it needs to be stored in a dry and ventilated place. Hai Tong Pi should be used under the guidance of traditional Chinese medicine practitioners, and should not be taken blindly, so as not to cause damage.