Endometrial Tolerance Analysis is not necessary for everyone, and is generally recommended for women with low embryo implantation success and recurrent miscarriages. Endometrial Tolerance Analysis refers to the state of tolerance of the embryo when it is implanted in the endometrium. Generally, the embryo beds in the endometrium for a short period of time, which is called the implantation window, and the test can be performed to better measure the duration of the implantation window, which is suitable for women with low embryo implantation success rate, so that the implantation can be performed at the optimal time and the implantation success rate can be improved. In addition, for women with recurrent miscarriages, which may also be caused by poor endometrial tolerance, this test can clarify the cause of the disease and provide targeted treatment to improve the conception rate. Endometrial Tolerance Analysis is an invasive test, and the need for it should be determined after a doctor’s consultation, based on the woman’s specific situation.