Objective To explore the ultrasonic imaging features of the lung implosion injury.Methods To establish the animal models of mild, moderate and severe thoracic injury. Changes in the lungs and chest wall were observed by using ultrasonic imaging before and after the blast and measured the TNF-αin each group,comparing with the results of pathological of analysis.Results 1.The ultrasound shows :the injured groups of light shows a little comet tail artifact in the lungs(the same tangent plane is less than three); the most area of comet tail artifact in the injured groups of medium(comet tail artifact occupy half and above of section) ; the injured groups of heavy shows the large area of “white lung” 2. All three groups of immediate TNF - a after the blast were larger than before the blast. This is statistically significant at P < 0.05. In the three groups of TNF- alpha group and any two or two comparisons (P<0.05) were statistically significant.3. The histopathological anatomy of the three groups shows that pulmonary hemorrhage, pulmonary congestion and pulmonary edema were aggravated orderly .Conclusion The lung implosion injury has the characteristic of ultrasonography,and the ultrasound image can appraise the range and intensity of it,it has laid a good foundation of evaluating the condition of patients,and it provides important reference value for early diagonosis and later treament.