HCG injection is also known as injectable chorionic gonadotropin, referred to as chorionic promotion, women can promote the rupture of the follicle discharge after injection of chorionic promotion, with a certain role in fertility preservation treatment. HCG injection can be used in the following cases: First, after pregnancy, the ultrasound examination found that there is a gestational sac in the uterine cavity, but the next day to check the blood HCG but found that the growth is slow, through the muscle injection of chorionic to promote the growth of HCG obvious, so as to play a certain role in the treatment of fertility preservation, to avoid embryonic development stops. Secondly, for women with ovulation dysfunction, if the eggs can grow and develop after taking Clomiphene, but cannot be discharged from the ovaries through normal rupture, it is necessary to promote the rupture of follicles through intramuscular injection of chorionic villus, and arrange for the preparation of pregnancy through coitus. Thirdly, for women who cannot conceive naturally, if they choose to undergo in vitro fertilization (IVF), it is usually necessary to give intramuscular injections to promote down regulation and then promote ovulation to retrieve eggs.