The oogenesis and ovary structure during development were studied in Haliotis diversicolor supertexta. According to the size and shape of oocyte, the morphology of nucleolus,the growth of yolk and the structure of follicle, oogenesis of H.d.supertexta can be divided into three stages as follows:oogonium, previtellogenic oocyte and vitellogenic oocyte. The ovary wall is composed of tunica adventitia and germinal epithelium which will produce oogonia and follicle cells.The follicle is the structure unit of ovary. The ovary development cycle can be divided into five stages according to the external morphology and inner structure of ovary: suspensive stage,proliferation stage,growing stage,maturation stage and breeding stage.