In the clinical left heart outflow tract malformation this disease is not rare, should actively understand this disease, because this disease to our health brings serious harm, and even to our life safety brings a risk, in life we should actively go to the prevention, let us take a look at the prevention of this disease is like: 1, pregnant women should avoid receiving radiation, careful use of some 1. Pregnant women should avoid radiation, use some chemical drugs, inject rubella vaccine, etc. to prevent viral infections as much as possible. Pregnant women should also strengthen nutrition and timely treatment of some chronic diseases. 2, prenatal diagnosis, to prevent the birth of children with diseases. 3. Keep the air circulating in the room and avoid crowded public places as much as possible to reduce the chance of respiratory infection. Add clothes in time with the cold weather and pay attention to the prevention of colds. 4, some immunodeficiency diseases can be prenatally diagnosed, such as the culture of amniotic fluid cell enzymology test can diagnose adenosine deaminase deficiency, nucleoside phosphorylase deficiency and some combined immunodeficiency diseases; fetal blood cell immunology test can diagnose CGD, X-linked gammaglobulinemia, severe combined immunodeficiency diseases so as to interrupt pregnancy to prevent the birth of affected children. 5, prevention target: the test is, in principle, for mothers-to-be with family genetic congenital malformations or heart disease, or pregnant women who have used drugs, suffered from viral infections during pregnancy, and have their own heart disease, diabetes and other diseases. These mothers-to-be have a higher chance of giving birth to a baby with a heart question. 6, pregnant mothers during pregnancy try not to go to places with environmental pollution, avoid bad emotions, avoid taking the wrong drugs before pregnancy, avoid all kinds of radiation, etc.