The occurrence, development, and decline of ovarian function are the foundation in women's whole life stages, which reflect the process beginning from embryo formation to the aging. Correct assessment of ovarian function is significant for evaluating the potential reproductive ability and predicting the age of menopause, as well as providing both individualized and proper treatment and preventive care based on physiological characteristics of women in different phases. Ovarian reserve (OR) is used to predict the potential fertility of women by evaluating the follicles and the quantity and quality of eggs. Currently, there are multiple indexes used to evaluate ovarian reserve, including anti-Mullerian hormone (AMH), follicle-stimulating hormone (FSH), estradiol (E2), inhibin B, antral follicle count (AFC), etc. Although some scholars combine multiple indexes to evaluate the ovarian function, these indexes are far less accurate, detailed, and comprehensive. To find an ideal method for evaluation of ovarian reserve is the hotspot in research of reproductive endocrine. The present authors, for the first time, put forward a classification system of ovarian reserve function after summarizing numerous cases. It can both accurately and effectively evaluate the ovarian function quantitatively. It is of great help in making clinical decisions and of great significance in future development.