Objective:To construct a new method for evaluating pulmonary contusion.Methods:Review the clinical data of blunt chest trauma patients with pulmonary contusion admitted to Shanghai Sixth People's Hospital from June 1, 2021 to March 1, 2022.Establishing inclusion and exclusion criteria.The degree of pulmonary contusion in the enrolled cases was assessed using Yang's index method and volume reconstruction method. And conduct correlation analysis on the calculation results of the two methods.Results:65 patients were enrolled. The pulmonary contusion ratio in the volume reconstruction method group was 0.08-0.62, with an average of 0.16±0.12, and the pulmonary contusion ratio in the Yang's index method group was 0.14-1.10, with an average of 0.32±0.22. The results calculated by the Yang's index method and the volume reconstruction method were linearly correlated.Conclusion:The calculation method of Yang's index method is simple and the calculation results are reliable. It can be used as a new method to evaluate pulmonary contusion.