Abstract: ［Abstract］Objective　To evaluate the application value of bedside lung ultrasound in diagnosis of neonatal severe pneumonia．Methods　Bedside lung ultrasound and chest X-ray were performed in 59 the newborn patients admitted to the newborn department for suspected severe pneumonia，from October 2015 to March 2016．According to the characteristics of the chest X-ray，patients were divided into consolidation group（widely spot shadow in double lung and airbronchograms）and the unconsolidation group（ enlargement，fuzzy texture in double lung or small patch sample changes）．Differences in ultrasonic characteristics were compared between the two groups． Results Ultrasonic image characteristics were pulmonary consolidation with air bronchograms，A-line disappearance，pleural line abnormalities. Among 23 patients with chest X-ray，21 patients were found pulmonary consolidation by lung ultrasound，and all 36 patients in unconsolidation group were not found pulmonary consolidation by lung ultrasound，and there was no significant difference in the detection rate by lung ultrasound between the two groups（P＞0.05）．The pulmonary ultrasound results of 20 cases in the consolidation group showed A-line disappearance，37 cases in the unconsolidation group showed A-line disappearance. There was no statistical significant differences between the two groups（P＞0.05）. The pulmonary ultrasound results showed 11 cases in the consolidation group and 15 cases in the unconsolidation group with pleural line abnormalities， there was no statistically significant differences between the two groups（ P＞0.05 ）. Conclusions　Ultrasound image characteristics of neonatal severe pneumonia include pulmonary consolidation and air bronchograms，A-line disappearance，pleural line abnormalities. Compared lung ultrasound and chest X-ray result，there was no difference between consolidation group and unconsolidation group. Both of the two methods can be used for evaluating the diagnosis of pneumonia.