The use of progesterone to regulate menstruation is carried out in three main ways First, with estrogen for cycle regulation. For example, the use of 21 days of supplementation with Glaxo, followed by 7 days of progesterone, which is the cycle treatment of estrogen and progesterone, will lead to menstruation in about a week after stopping the drug. Secondly, patients with luteal insufficiency can use progesterone to promote the onset of menstruation. Generally, progesterone is added from after ovulation, 2 times/day, 100 mg/time, for 10-14 days, and the patient will have menstruation about a week after stopping the medication. Third, use progesterone to promote withdrawal bleeding. In this case, patients are required to preferably do ultrasound to observe the thickness of the endometrium. When the thickness of the endometrium of a woman is greater than 0.8cm, it suggests that the patient has a certain dose of estrogen in her body, and she can use progesterone, a progestin, for retreat bleeding. It is used for about 3 days when progesterone is injected intramuscularly and 5-7 days when progesterone is taken orally, and menstruation will occur within a week after stopping the medication.