The ovaries are an important reproductive organ for women, and are responsible for endocrine and ovulation functions. In general, the ovarian function of women between the ages of 40 and 50 begins to decline, but the specific time of decline and the length of time varies from person to person, and can be judged through relevant examinations. The more you get older, the lower the reserve function of the ovaries. A few women can have premature ovarian failure due to various factors; 2. Anti-Mullerian hormone (AMH): the normal value of AMH is 2-6.5ng/ml, AMH<1.22ng/ml indicates a decrease in ovarian reserve function; 3. Sex hormone examination: blood collected on the 2nd-3rd day of menstruation, such as FSH/LH>3 can evaluate the diminished ovarian reserve function; 4. Basic sinus follicle count ( AFC): Total number of small follicles less than 10mm in diameter counted by transvaginal ultrasound on day 2-4 of menstruation, AFC<5 indicates poor ovarian reserve function. 2. Ways to delay ovarian function decline 1. ensure a good lifestyle, no smoking, no drinking, moderate exercise, balanced diet, stress relief; 2. stay away from harmful factors, such as avoiding unclean sex, timely treatment of gynecological diseases, fewer abortions, etc.; 3. autoimmune disorders may cause ovarian function damage and should be treated as early as possible.