The grade of blastocysts has a certain impact on the success rate of transplantation, and the success rate of transplantation is relatively high for high-quality grade blastocysts. According to the developmental quality of blastocysts, they can be divided into different grades such as grade A, grade B, grade C and grade D. Among them, grade A and grade B blastocysts are relatively good in quality, and the success rate of transplantation is relatively high. grade C blastocysts do not belong to high-quality blastocysts, and the success rate of transplantation is relatively low. grade D blastocysts belong to the poorer quality blastocysts, and are generally not suitable for transplantation. If a woman chooses assisted reproductive technology to get pregnant, try to choose high-quality blastocysts for transplantation under the guidance of professional doctors, the success rate may be significantly higher, which is conducive to eugenics.