Herbal fumigation therapy is an important means of treating anal diseases and is widely used clinically before and after surgery for anal diseases. Its principle is to utilize warm herbal aqueous solution to fumigate the anal area. Due to the effect of medicine, it causes vasodilatation at the lesion, promotes local blood circulation, makes the meridians and collaterals unblocked, qi and blood smooth, edema absorbed, inflammation subsided, pain relieved, so as to achieve the therapeutic purpose. The method is mainly applied to internal hemorrhoid prolapse, blood in stool, anal fissure, inflammatory hemorrhoids, prolapse, anal swelling and pain, anal eczema and postoperative wound pain relief. Specific application, according to different diseases, the use of different prescriptions, the drugs according to a certain concentration ratio, prepared into a liquid, poured into the basin, the patient will sit on the buttocks squatting on the top of the medicine basin, the first fumigation, to be when the liquid is not scalding, and then soak the buttocks in the basin sitz bath. Generally 10-20 minutes is appropriate. Remember to dry the anus locally after the sitz bath, keep the anus locally dry.