Pregnancy to do genetic screening, mainly to draw blood to test the fetus with congenital genetic diseases and chromosomal disorders of high risk, because the fetus in the gestation period may lead to malformation of embryonic development, embryonic arrest and other chances of increasing, even if the fetus can survive, the baby born after the impact of the quality of life may lead to mental retardation. From the perspective of eugenics, women need to have blood drawn for early Down’s syndrome screening at 11-14 weeks of gestation, and if there is a high risk of screening, non-invasive DNA or amniocentesis is needed to further confirm the diagnosis, and if there is a more serious genetic or chromosomal disorder, termination of pregnancy needs to be given as early as possible. Routine genetic testing during pregnancy to detect hereditary or chromosomal disorders before conception, and testing of both sexes in preparation for pregnancy to maximize access to high-quality eggs and sperm for pregnancy.