Objective To detect the clinical value of the levels of serum procalcitonin(PCT),C-reactive protein(CRP) and white cell count(WBC) in children with pneumonia.Methods 121 children with pneumonia were divided randomLy into bacterial pneumonia group(group A,n=59) and virus pneumonia group(group B,n=62).PCT,CRP and WBC levels were detected in all cases.Compare the sensitivity and specificity of three indicators in discriminating bacterial pneumonia and virus pneumonia.Results Sensitivity of PCT in diagnosing bacterial pneumonia was 85.9%,and specificity was 92%.Sensitivity of CRP in diagnosing bacterial pneumonia was 59.2%,and specificity was 88%.Sensitivity of WBC in diagnosing bacterial pneumonia was 70.4%,and specificity was 62%.Conclusions PCT is a valuable indicator in the diagnosis of bacterial pneumonia in children and has higher sensitivity and specificity than CRP and WBC.