ObjectiveTo investigate the value of pulmonary ultrasound in the assessment of acute exacerbation of chronic obstructive pulmonary disease with pneumonia.Methods Forty-six patients with acute exacerbation of pneumonitis with chronic obstructive pulmonary disease were selected, who underwent bedside lung ultrasound examinations. The number of lung ultrasound B lines and lung ultrasound scores were calculated in each patient, and the correlation between the lung ultrasound scores and the oxygenation index was analyzed ; the ROC curve was used to analyze thediagnostic efficacy of the lung ultrasound scores and the oxygenation index for AECOPD with pneumonia.Results The lung ultrasound score of 46 patients was (8.1 ± 2.0) points. Correlation analysis showed that lung ultrasound score was negatively correlated with oxygenation index (r = -0.69, P <0.05). ROC curve analysis showed that the lung ultrasound score was 8.7, the cut-off value was 90.8%, the specificity was 87.3% ,the accuracy was 89.1% , and the area under the curve was 0.814 . The oxygenation index was 193 mm Hg. The cutoff value was 87.2% for the diagnosis of AECOPD with pneumonia, with a specificity of 83.3%, an accuracy of 85.6%, and an area under the curve of 0.779.ConclusionBedside ultrasound to determine the lungs of patients with acute exacerbation of chronic obstructive pulmonary disease and pneumonitis is relatively simple and reproducible,and have good clinical value.