The process of transferring frozen blastocysts in an artificial cycle mainly involves some basic tests and endometrial cycle preparation, followed by the transfer. The specific process is as follows: 1. Days 2-13 of menstruation (taking the date of menstruation as the first day): give topical medication, estrogen and progesterone supplementation. 2. Day 14 or 15 of menstruation: Check the endometrial readiness to see if it meets the pre-transplantation standards and requirements. Continue medication if necessary. 3. After the 17th day of menstruation: Laboratory technicians will remove 1~3 frozen embryos from the patient for thawing, and then the doctor will transfer the embryos to the patient’s uterus after thawing. Around the 10th day after the implantation procedure, a pregnancy test will be conducted to check if the implantation is successful, and blood HCG and progesterone will be rechecked, and ultrasound will be conducted three weeks later to check if the fetus is developing normally.