Small uterus is due to uterine dysplasia, also known as infantile uterus. It is due to the fact that the development of the uterus stops after the rendezvous of the paramedian tube in the embryo, so the uterus is smaller than normal, its position is often extremely forward-flexed or backward, the cervix is conical, longer than normal, and the ratio of the uterine body to the cervix is 1:1 or 2:3. The patient has a low menstrual flow and does not have children after marriage. The treatment method uses small doses of estrogen plus progestin sequential medication, can start from the first five days of menstruation every night oral combined with estrogen v Bemelix w 0.625mg or estradiol valerate v supplemental Jiale, Clomid w 2mg, for 21 days, on the 11th day of medication plus mestanolone acetate 8mg w progesterone, once a day for 10 days, the two drugs at the same time, then wait for the pestle, since the fifth day of menstruation Start the second cycle of the above mentioned medication again. Total 6-12 cycles. After taking the medication, ultrasound is done every 3 months to measure the size of the uterine diameter and to observe whether the uterus is enlarged.