The endothelium of 8~14mm is suitable for transplantation, and the clinical regulations stipulate that the thickness of endothelium is more than 7mm to be suitable for transplantation. IVF is also known as In Vitro Fertilization (IVF) embryo transfer, which allows a woman to conceive artificially if the couple is unable to conceive naturally. One of the requirements for IVF is to have the right thickness of endometrium, which is important for the success of the transfer. Clinical regulations stipulate that only endometrial thickness of more than 7mm can be used for IVF, and endometrial thickness of 8~14mm is more suitable for transplantation. Endometrial thickness of less than 8mm or more than 14mm will affect the endometrial tolerance, and the success rate of IVF will also be affected. In addition to good endometrial thickness, in order to increase the success rate of IVF, it is also necessary to choose well-developed embryos, and it is recommended to go to a regular hospital for IVF.