Objective:To investigate the clinical efficacy of bronchoscopic alveolar lavage as an adjuvant therapy for severe Mycoplasma pneumoniae pneumonia(SMPP)in children,and analyze its impact on peripheral blood C-reactive protein(CRP)and procalcitonin(PCT)levels.Methods:A total of 160 children with SMPP were enrolled in the study.Using different treat-ment regimens,they were assigned to the control group and the observation group,80 cases in each group.The groups received conventional treatment and bronchoscopic alveolar lavage assisted conventional treatment,respectively.The duration of clinical symptoms,clinical efficacy,peripheral blood CRP and PCT levels,and complication rate were compared between the two groups.Results:Inter-group comparisons found that the duration of clinical symptoms was shorter in the observation group(P<0.05).The overall clinical effective rate was higher in the observation group(P<0.05).After 2 weeks of treatment,pe-ripheral blood CRP and PCT levels in both groups decreased(P<0.05),and the observation group was lower than the control group(P<0.05).The complication rate in the observation group was lower than that in the control group(3.75%vs.12.50%,P<0.05).Conclusion:Bronchoscopic alveolar lavage as an adjuvant therapy can achieve significant therapeutic effects on SMPP in children.It can shorten the duration of clinical symptoms,lower peripheral blood CRP and PCT levels,and reduce complication risk.