Congenital heart disease is the most common type of congenital malformation, which refers to an anatomical abnormality caused by formation disorders or developmental abnormalities of the heart and large blood vessels during embryonic development, or failure to close channels that should close automatically after birth (which is normal in the fetus). Prevention of congenital heart disease is particularly important, the following is the prevention of congenital heart disease methods. 1, marriage test: the incidence of congenital heart disease in children is about 4 ‰ to 8 ‰, which can be a common congenital disease. With the improvement of medical level, many children with congenital heart disease live well after surgical treatment and grow up to have a family. However, all people with congenital heart disease want to have a healthy child when they are parents themselves, and the best way to do this is to go to a hospital for premarital screening and genetic counseling before marriage. Because congenital heart disease is a polygenic genetic disease, it is now recognized that congenital heart disease can be caused by environmental factors and genetic factors or both together, especially the latter is important, and about 90% of congenital heart disease is caused by the combination of genetic plus environmental interaction. Many people think that people with congenital heart disease are the same as normal people after surgery and there is no danger of having children, this view is very incomplete, they only pay attention to the tolerance of the heart and ignore the hereditary nature of the disease. Therefore, to fully understand the impact of congenital heart disease on marriage and childbirth, you can go to a designated premarital examination unit, or you can go to a cardiology specialist for a checkup, such as a color ultrasound of the heart, and genetic counseling according to the type of your heart disease and listen to your doctor’s advice. 2, do not touch pets because the bacteria and microorganisms on pets may also cause congenital heart disease in children. 3, although the cause of congenital heart disease is not very clear, but in order to prevent the occurrence of congenital heart disease, attention should be paid to the mother’s health care during pregnancy, especially in the early stages of pregnancy, such as active prevention of rubella, influenza, mumps and other viral infections. Avoid exposure to radiation and some harmful substances. Use medications under the guidance of doctors and avoid taking drugs that have an impact on fetal development, such as anti-cancer drugs and methylglyoxal. Actively treat primary diseases, such as diabetes. Pay attention to reasonable diet and avoid nutritional deficiency. Prevent local mechanical compression around the fetus. In short, in order to prevent congenital heart disease, all factors related to the development should be avoided. 4, in early pregnancy (before 3 months) try not to sit for too long in front of the computer microwave oven and other places with strong magnetic fields because the fetus is still unstable at this time and various organs are still forming stage is likely to cause congenital heart disease in children.