Benign paroxysmal positional vertigo, commonly known as otoliths, is extremely common in vertigo, with a high incidence, accounting for 20-40% of all peripheral vertigo and 9% of the elderly population. There are two hypotheses of BPPV, namely, semicircular canal stone disease and potbelly crest stone disease. 1. Semicircular canal stone theory: When the head is moved to the excitation position, the otoliths are moved away from the potbelly by gravity and form an endolymphatic flow away from the potbelly, which causes displacement of the crest and causes vertigo and nystagmus. 2. Potbelly crest stone theory: Due to The otolith fragment, which is denatured, detaches from the ellipsoidal capsule and attaches to the apex of the ridge of the canal, causing the difference in density between the endolymph and the apex of the ridge, resulting in the difference in specific gravity and the abnormal perception of gravity by the ridge of the canal. The theory of semicircular canal stones is currently more widely accepted, but some scholars believe that both mechanisms are possible, but that canal stones are more likely to occur. The vast majority of causes of BPPV are idiopathic, but a few patients can suffer from vertigo due to head trauma, viral labyrinthitis, Meniere’s disease, low activity, vascular embolism, inadequate blood supply, and ear disease and ear surgery. Clinical characteristics of hemianopsia: 1. There is a latency period of 1 to 40s for the appearance of vertigo after the patient is in the excitation head position; 2. The latency period of nystagmus and vertigo is the same; 3. The intensity of vertigo and nystagmus fluctuates, first heavy and then light, with a time course of no more than 60s; 4. Canaliculitis is the most common type of BPPV. The clinical characteristics of jugular crest calculi: 1, vertigo appears immediately when the patient is in the excitation position; 2, the latency period of nystagmus and vertigo is the same; the symptoms persist without changing the excitation position; 3, it can occur in the posterior semicircular canal or in the horizontal semicircular canal, and this type of BPPV is relatively rare. The treatment of BPPV is based on canal stone repositioning therapy, and the efficiency of this therapy is 71%-92%. The canalolith repositioning method is mainly used in the treatment of posterior and superior semicircular canal BPPV by manipulating the patient to change five positions, thus allowing the canalolith fragments from the posterior and superior semicircular canals to pass through the common foot into the elliptical capsule. Although the disease is somewhat self-limiting, it usually takes weeks or months or even years for the symptoms to resolve, and the attacks may be accompanied by nausea and vomiting, but there is usually no hearing impairment, tinnitus and other symptoms, no central nervous symptoms and signs, and no discomfort during the remission period. After the treatment of otolith repositioning, most of the patients’ symptoms disappear immediately after the successful repositioning of otoliths, which can quickly relieve the patients from the pain caused by vertigo. Most of the patients have good prognosis, but a few of them, such as the apex of jugular crest stone, can be treated by surgery if conservative treatment is not effective. According to clinical statistics, there is a recurrence rate of about 10%-15% per year, but the application of tubular stone repositioning therapy is still effective. Through clinical verification, BPPV is clinically simple and easy to perform, reliable and cost-saving, and is currently the treatment of choice for this disease. Patients with otoliths should be placed in the healthy-side position for the first two nights after resetting. Avoid vigorous activities such as playing ball, swimming, etc. within one month after reset, avoid washing hair after lying down, and keep sufficient sleep. Some patients may experience unstable walking or even slight vertigo for two to three days after the reset, no need to be nervous. Some patients may have recurrence after several months or years of treatment, they can just repeat the treatment with the same method.