The technique of freeze thaw embryo transfer is now widely available, and in most fertility centers the number of cycles of freeze thaw embryo transfer is rather higher than the number of cycles of natural cycle transfer. How to improve the success rate of freeze thaw embryo transfer: First of all, before performing freeze thaw embryo transfer, the patient should be in a better state both mentally and physically, and must be relaxed and have good nutritional reserves. Under the guidance of the clinician, the endometrium should be in an optimal state. The best possible time cycle window for embryo transfer is preferred, and we will use a preferential approach in our clinical work to reduce the damage during the freezing and resuscitation process, so that the embryos reach a better potential. In this case, the transfer of the better embryos into the prepared endometrial environment will result in a better pregnancy outcome and also a better pregnancy experience.