If a woman fails to ovulate normally, when the follicle develops to 18mm it is a mature follicle and the patient can choose to inject chorionic gonadotropin. Ovulation will occur within 36-48 hours after the injection, so the patient can choose to have intercourse once on the day of the injection, and every other day, 2-3 times in a row, during which the patient needs to continue to use ultrasound to monitor the follicle’s growth and discharge, in some cases, even if the injection of chorionic gonadotropin, the follicle can not be discharged, but continue to increase in size and develop into cysts. In this case, the patient cannot be treated with repeated injections of chorionic gonadotropin. Instead, the patient should find out why the follicles are not expelling normally and can choose to undergo surgery or other methods of treatment. If the follicle can be normally ovulated after using chorionic gonadotropin to promote ovulation, but the patient cannot get pregnant during continuous ovulation, it is considered that the infertility may be caused by tubal or uterine factors, and it is necessary to carry out other aspects of the examination.