From September 2007 to August 2008,8-11 adult males of Barred Buttonquail(Turnix suscitator) were collected monthly in Chengmai,Hainan Island,China,to study their male cycle.The results showed that seasonal changes in weight and volume of testes,diameter of seminiferous tubule,and thickness of seminiferous epithelium were evident in T.suscitator.The largest testes were observed in July,and the smallest were observed from October to December.Spermatogenesis was intiated in March,very active in April to September when spermatozoa had already appeared inside the lumen of seminiferous tubules,while ceased in November.The annual testicular activities indicate that the breeding season is from March to October,while the non-breading season is from November to next February in T.suscitator.