Ultrasound is a way to determine premature ovarian failure, but it cannot be used as an important diagnostic criterion and can only be used as an auxiliary test to determine if there is a certain amount of atrophy in the size of the ovaries bilaterally and if it is consistent with the reference range of premature ovarian failure. The most important standard test is the fasting blood test for the six endocrine hormones to determine whether the follicle stimulating hormone is outside the normal range and whether the ratio between luteinizing hormone and follicle stimulating hormone is outside the normal range, which can determine whether the ovaries are in a state of premature failure. It is very important that both tests are performed in such a way to make an accurate assessment and judgment.