The reproductive system and gonad development and germ cell occur rence of Hemifusus tuba have been studied by using tissue section techniques.Through tissue section observation,the results showed that H.tuba is gonochorism,and the male reproductive system is mainly composed of spermary,seminal vesicle,prostate,deferent duct and the penis.The structure of the spermary is more branches tubular gland,is composed of the seminiferous tubules and ductulus efferens.According to the size,shape and distribution features of the cell,this paper analysed the form of spermatogenesis which experienced a fivestage process,from spermatogonia,primary spermatocytes,secondary spermatocytes,sperm cells to sperms.According to the topography of the genital cells in the seminiferous tubules and the quantity of the intestitial cell,the development will be divided into the testes of degradtion period,developing period(spermatocytes separatist period),maturation and mature period,degradtion period,in all four periods.The structure type of the ovary was follicular and it consists of follicle and genital ducts,was full of eosinophilic granule.The ovary development can be divided into following five periods:proliferation period,growth period,maturation period,spawning period and resting period.By the germ cells’ size,shape and the amount of yolk granules inside,the oogenesis H.tuba might be divided into proliferation period,growth period and maturation period.Gonad and germ cell developments of H.tuba are not synchronized,for they were repeatedly sexually mature,repeatedly ranked fine way.