Fetal pulmonary artery crossover needs to be judged according to the actual situation, and then to carry out conditioning treatment: first, if it is just a simple fetal pulmonary artery crossover, there is no combined pulmonary artery stenosis and other problems, there is no need to worry too much, it will not affect the lung function, only the crossover situation may be a little abnormal development, basically it will not affect the life of the fetus, you can temporarily do not need to carry out treatment. The crossed pulmonary arteries may cause rupture of the pulmonary arteries after the birth of the fetus, which requires related surgical treatment; if there is no onset, there will be no effect; secondly, if there is a combination of pulmonary stenosis and other problems, timely examination and treatment is required, and the actual situation of the fetus is regulated with medication or surgery, and regular check-ups are required to observe the development of the fetus.