The difference between menstrual descents and luteal descents lies mainly in the timing of the medication used and the dosage of the medication used. 1.Time: (1) Luteal phase down-regulation generally refers to a 14-day program, in the luteal phase by intramuscular injection of down-regulation drugs, after 14 days for hormone levels and ultrasound examination, if the standard is reached, then start using drugs to promote ovulation. (2) Menstrual period down regulation generally refers to a 28-day program, also during menstruation through intramuscular injection of down-regulating drugs, and then through the examination of hormone levels and ultrasound, if the standard is reached, then begin to use ovulation-promoting drugs. 2. Drug dosage: (1) The dosage of down-regulation drugs generally used in luteal phase down-regulation is 1 to 1.85 milligrams. (2) The usual dose of down-regulation drugs used during the menstrual phase is 3.75 mg. The above two programs have their own advantages and disadvantages, in the specific use of drugs also need to be based on their own situation, under the guidance of the doctor to choose the most suitable program.