Pneumonia is a major disease threatening the health of children, and its diagnosis mainly depends on medical history, physical examination, chest X-ray and CT examination. The reliability of the physical examination was low, while the chest X-ray and CT examination had certain radiation damage to children. Therefore, in recent years, the application of lung ultrasound is popular in diagnosis of pneumonia in pediatric patients. This article reviewed the application of lung ultrasonography in diagnosis and follow-up of pneumonia in pediatric patients..