The long protocol is one of the most common methods of IVF treatment, which involves controlled ovulation, including descending regulation and ovulation promotion, in order to obtain a high quality, moderate number of eggs and thus a moderate number of high quality embryos for transfer. Long protocols are divided into long protocols for the follicular phase, or long protocols for the luteal phase. The follicular phase long protocol involves injecting a hypoglycemic drug, usually at a dose of 3.75mg, one shot during the menstrual period, and then starting ovulation pills 28-36 days after the hypoglycemic injection and using them until the follicles are of the right size to retrieve eggs. The long luteal phase regimen involves the administration of downregulation drugs at a dose of 1.0-1.875mg during the luteal phase of menstruation, approximately 20 days after the regular menstrual period, and the initiation of ovulation-promoting drugs 14-18 days after the downregulation drugs until the follicles are of the right size for egg retrieval. There are two types of luteal phase long regimens, one is long-acting and one is short-acting. The short-acting regimen requires daily shots until egg retrieval, and the short-acting regimen is 0.1mg of each drug.