【Abstract】 Objective To analyze the characteristics of nystagmus and the clinical efficacy in patients diagnosed with light cupula.Methods From January 2018 to January 2021, patients diagnosed with light cupula were enrolled in the vertigo clinic of the Department of JinZhong First People's Hospital.The characteristics of nystagmus were recorded and analyzed by video electronystagmus.All patients were treated with Barbecue roll maneuver and oral drug after reduction，and the efficacy was evaluated immediately,one week and one month later.Results There were 42 patients with light cupula, of which two secondary cases (4.76%) were secondary to sudden deafness. All of the patients,spontaneous nystagmus was appeared in upright position at 10 case(23.8%) and in supine position at 24 cases (57.1%), which were oriented to the healthy side and appeared in the second zero plane of nystagmus disappearance located on the affected side (P < 0.05). All patients showed persistent geostatic positional nystagmus in bilateral head turning position and the affected side was left in 25 cases (59.5%), right in 17 cases (40.5%), and second zero plane in 24 cases (57.1%). The mean duration was > 1min, the mean SPV was > 20°/s, and there was no obvious incubation period.After treatment immediately 0 cases were cured immediately, 5 cases were improved (11.9%) and 37 cases were invalid (88.1%). After one week, 2 cases (4.8%) were cured, 18 cases (42.90%) were improved, and 22 cases (52.4%) were invalid. After 1 month, 39 cases (92.86%) were cured, 3 cases (7.14%) were improved, and 0 cases were invalid. There was statistically significant difference between the effectafter treatment immediately，one week later and one month later. Age was correlated with immediate curative effect (P < 0.05). The ocular shock of affected side may be correlated with the curative effect one week later (P < 0.05).The intensity and duration of nystagmus on the affected side were correlated with the curative effect after 1 month (P < 0.05).Conclusion Nystagmus with light cupula is characterized by persistent geotropism, long duration and no incubation period. And partial zero plane may occur in partial patient accompanied by supine nystagmus.the disease has a certain self-healing and good prognosis. Age, intensity and duration of nystagmus on affected side have influence on the prognosis of patients. Patients with small age and weak intensity of nystagmus and short duration of nystagmus have relatively better efficacy.