In this study, we analyzed the characteristics of nystagmus on supine roll test in 72 patients with HSC-BPPV, 49 of whom were treated with CRP, as well as 38 healthy subjects, and found that head-turning nystagmus was in the same direction as head turning in all groups and that its intensity did not differ significantly among groups. The gene discussed is CRP; the disease is Nystagmus.