The success rate of IVF is higher at this stage, but over the age of 35, the ovarian function of women declines significantly and the success rate of IVF decreases, so if you want to do IVF, you must do it before it is too late. 2. Infertility is caused by a variety of reasons, including uterine The success rate of IVF for patients with infertility caused by endometriosis and polycystic ovary syndrome is lower than that of other patients. The endometrium is important for the embryo and is an important place for embryo implantation. If the endometrium is thick enough, with rich blood flow and good cell division, it will increase the embryo implantation rate, while on the contrary, if the endometrium is too thin, the embryo will not be easily implanted. If the endometrial lining is damaged or if the uterus is myometrized, the embryo may not be able to be laid and the success rate may be affected. 4. Psychological state The influence of psychological state is also very crucial, excessive psychological tension may cause endocrine disorders, which may lead to difficulties in embryo laying, so infertile women should maintain psychological balance and be optimistic during IVF treatment. 5. The quality of embryos is a key factor in the success rate of IVF, as high quality embryos are easy to succeed, while poor quality embryos have a high failure rate. Clinically, the quality of embryos can only be distinguished by their morphology.