Abstract: Objective：To explore the characteristics of TCM constitution and susceptible risk factors of children with severe Mycoplasma pneumoniae pneumonia.Methods：A total of 122 children treated in the Affiliated Hospital of Liaoning University of Traditional Chinese Medicine from December 2023 to June 2024 were selected as the observation group,and 90 healthy children receiving physical examination during the same period were included as the control group.The two groups of children were required to fill in the risk factor questionnaire and TCM constitution identification scale.Results：The distribution of the top four constitutions in children with SMPP was as follows:qi-deficiency constitution (34 cases,27.9%),yin-deficiency constitution (29 cases,23.8%),inherited special constitution (15 cases,12.3%),and qi-stagnation constitution (13 cases,10.7%).There were statistically significant differences in balanced constitution,qi-deficiency constitution,yin-deficiency constitution,allergy,dieting structure,exercising habits and antibiotic use habits between the two groups of children (P<0.05).According to binary Logistic regression analysis,unreasonable dieting structure,less exercise,and frequent use of antibiotics were likely to be risk factors for the occurrence of SMPP in children,while balanced constitution was likely to be a protective factor for the occurrence of SMPP in children.Conclusion：TCM constitution,dieting and exercising habits and frequent use of antibiotics are related to the occurrence of SMPP in children,and it is recommended to pay attention to the daily physical care,the development of good living habits and the rational use of antibiotics in children.

Key words: Severe Mycoplasma pneumoniae pneumonia, Traditional Chinese medicine constitution, Risk factor, Regression analysis；Child