The success rate of transferring 1 embryo is related to the quality of the embryo, the patient’s physical condition, the uterine environment and many other factors, as well as the technical maturity of the IVF hospital, so the success rate varies greatly in clinical practice, generally between 20% and 60%. If the patient has organic or endocrine disorders such as thin endometrium and polycystic ovary syndrome, and if the patient is older and the quality of eggs is declining, the chance of success of transferring one blastocyst is very low, around 20%. If the patient does 3rd generation IVF, he/she can select good quality embryos for transfer, which can improve the chance of success to some extent. If the patient is only infertile due to abnormal fallopian tubes, the uterus and ovaries are functioning very normally, the patient is younger, in better health, and the eggs are of better quality, the chance of pregnancy will be very high, reaching about 60%.