Objective To explore the credibility of ultrasound‘s diagnosis of children"s pneumonia, to provide a new method for diagnosing of children pneumonia. Methods We collected 60 cases pediatric pneumonia hospitalized children in July 2015 to October 2016 in our hospital, who did the chest radiograph and lung ultrasound in 24 hours. Children through With the history, physical examination, laboratory testing (not including of ultrasonic) to make a diagnosis of pneumonia, the results of chest radiograph and lung ultrasound are compared. Results Selecting 34 cases from 60 children who were considered to be pneumonia, the X-ray diagnosed 30 (88.2%) cases, ultrasound diagnosed 33 (97.1%) cases, with chest X-ray ,3 cases were not confirmed pneumonia; 1 case with negatie ultrasound, X-ray performance is positive. The sensitivity of diagnosing of ultrasonic for the pneumonia is 96.5%, specificity is 96.1%, positive predictive value is 97.6%, negative predictive value is 76.5%. Conclusion Lung ultrasound shows high accuracy in the detection of children pneumonia and is a reliable image diagnosis method for children pnermonia.