〔Abstract〕 Objective To investigate whether in the onset time of sudden sensorineural hearing loss(SSHL) is seasonal. Methods The clinical data of 348 patients with SSHL in the past 10 years were collected. According to sex, age, unilateral/bilateral, accompanying symptoms and risk factors, they were divided into different subgroups. The seasonal variability in the onset of patients in general group and each subgroup was identified by circular distribution statistics. Results The overall onset of SSHL had no significant seasonal variability, but showed a seasonal trend of more in spring and autumn and least in summer. The male group had significant seasonal variability(P<0.05), and the incidence was the highest in autumn. There was significant seasonal variability in hypertension group and hyperglycemia group(P<0.05), and the incidence was concentrated in cold months. There was no significant seasonal variability in the other subgroups. Conclusion The onset of SSHL has seasonal trend of more in spring and autumn and the least in summer. The onset of SSHL in male group, hypertension group and hyperglycemia group has significant seasonal variability.