TORCH is one of the more important preconception tests, representing four pathogenic microorganisms that may affect normal pregnancy and fetal development: TO is Toxoplasma gondii, R is rubella virus, C is cytomegalovirus, and H is herpes simplex virus. If infected with pathogenic microorganisms during pregnancy, the pathogenic microorganisms may enter the fetus through the blood circulation of the placenta and affect the normal development of the baby leading to early miscarriage, fetal malformation, fetal death in utero, fetus with congenital diseases, etc. The incidence of adverse pregnancy outcomes increases significantly. During the eugenics examination before pregnancy, it is necessary to routinely do the examination of pathogenic microorganisms, and if an infection with pathogenic microorganisms is found before pregnancy, appropriate measures should be taken to treat it.