Dyspnea in 36-week preterm infants may be caused by pulmonary dysplasia, hypoxia and pneumonia. 1. Lung dysplasia: the function of the lungs of 36-week preterm infants is underdeveloped, and the surface of the alveoli lacks active substances, so they are prone to have dyspnea in the postnatal period. 2. Hypoxia: 36 weeks preterm babies have respiratory distress in a relatively short period of time after birth, probably due to the failure of amniotic fluid in the respiratory tract to be discharged in a timely and complete manner after birth, resulting in respiratory tract obstruction, leading to fetal hypoxia, which is mainly manifested in fetal respiratory distress. 3. Pneumonia: Preterm babies are weak and prone to upper respiratory tract infections during pregnancy, which in turn lead to pneumonia, with respiratory distress as the main manifestation. 36 weeks premature baby lung function has not yet fully developed, as well as prone to hypoxia, pneumonia and other conditions, so it is easy to symptoms of respiratory distress, if abnormalities occur should be timely hospital treatment, at the same time to strengthen the daily care of premature babies.