Pre-implantation genetic diagnosis technology is a biogenetic technique that helps humans to select the healthiest offspring to be born, offering couples with genetic disorders the opportunity to have healthy children. This technique also requires in vitro fertilization to obtain embryos. When the embryo develops into a small 4-8 cell embryo, 1 or 2 cells (commonly known medically as schizonts) are removed under a microscope for genetic examination and kept intact. If it is clear that the embryo is free of genetic disease, it is then transferred to the human uterus to continue its growth and development. This method has been successful since 1989. In reality, 1/5-1/4 of the population has hereditary diseases, and each person carries an average of 5-6 recessive genes. If it is clear that the embryo is free of hereditary diseases before it is transferred, it will greatly improve the quality of the baby after birth. The Ministry of Health has clearly documented the contraindications and indications for this technology, and it is forbidden to perform PGD diagnosis for sex selection in patients without hereditary diseases.