Abstract: Objective: To explore the diagnostic value of bedside ultrasound in ICU (ICU) for patients with multiple trauma and chest injury.Method: Selection of ICU in our hospital treatment of 100 cases of multiple trauma and suspected of combined thoracic injury were collected from February 2016 to February 2017, the time, all the patients were from our hospital trained doctors bedside ultrasound, chest X-ray, chest CT and accept the check to check within 2 hafter the clinical final diagnosis as a result the gold standard, the calculation of bedside ultrasound in differential diagnosis of chest injury in value.Result: One hundred cases of multiple trauma patients with suspected chest injury confirmed 77 cases of patients with clinical chest injury, including 13 cases of pneumothorax and pleural effusion in 50 cases, 28 cases with pulmonary contusion, 6 cases with pericardial effusion, 2 cases with traumatic diaphragmatic hernia;bedside ultrasound diagnosis and clinical diagnosis results:the coincidence rate of pneumothorax 84.62%, pleural effusion in 94.00%, pulmonary contusion, 82.14% pericardial effusion, 100.00% traumatic diaphragmatic hernia in 50.00%, with the result of diagnosis and CT diagnosis results the rate difference was not statistically significant (P>0.05);bedside ultrasound in diagnosis of pneumothorax, pleural effusion fluid, pulmonary contusion, pericardial effusion in the chest radiograph (coincidence rate was significantly higher than that of P<0.05);the average time of bedside ultrasound and chest X-ray examination is significantly lower than the CT (P<0.05) CT, the average time is significantly lower than the chest radiograph (P<0.05);bedside ultrasound diagnosis The sensitivity of chest injury was 88.31%, the specificity was 91.30%, the misdiagnosis rate was11.69%, the misdiagnosis rate was 8.70%;the sensitivity of CT in differential diagnosis of chest injury was96.10%, the specificity was 95.65%, the misdiagnosis rate was 3.90%, the misdiagnosis rate was 4.35%;the sensitivity of chest X-ray differential diagnosis of chest injury was 76.62%, the specificity was 73.91%.The misdiagnosis rate was 23.38%, the misdiagnosis rate was 26.09%.Conclusion: ICU bedside ultrasound has the advantages of short time and high diagnostic accuracy in the diagnosis of multiple trauma patients with chest injury.