Explosive lung injury is the main injury caused by military struggle, terrorist attacks and explosive safety accidents. The incidence of explosive lung injury is increasing all over the world. At present, there is a lack of effective diagnostic measures. Recent studies have found that ultrasound plays an important role in the diagnosis of lung injury. 1. B Line counting: the increase or decrease of B line is positively correlated with the severity of lung injury; 2. Gas or fluid-containing tubular structure is an important feature in the diagnosis of pulmonary consolidation; 3. Echo-free area in thoracic cavity is an important feature in the diagnosis of pleural effusion. Using the characteristics of pulmonary ultrasound, the severity of lung injury caused by explosion can be assessed quickly, effectively and early.