Objective To explore the risk factors of children pneumonia infected by mycoplasma pneumoniae ( MPP) , and to provide basis for preventing and treating MPP. Methods With case-control study method, we retrospectively collected data of 105 cases of MPP and 149 cases of non-MPP, and then used single factor and multiple factors logistic regression analysis methods to screen influencing factors of MPP. Results Single factor logistic regression results indicated that age, repeated re-spiratory infection, atopic constitution, bad living environment, hemoptysis, elevated ESR, the increase of white blood cell, pos-itive IgM antibody, tubercle shadow, ground-glass shadow, patchy shadow and tree-in-bud pulmonary were the possible risk fac-tors of MPP. Multiple factors logistic regression result showed that age (OR=1. 486), repeated respiratory infection (OR=3. 337), positive IgM antibody (OR=2. 524), tubercle shadow (OR=3. 673, ground-glass shadow (OR=3. 232) and tree-in-bud pulmonary (OR=8. 199) were risk factors of MPP. Conclusion The independent risk factors of MPP include age, repeated respiratory infection, positive IgM antibody and preternatural result of early X imageology. So we should take corresponding inter-vention measures to aim directly at these risk factors.%目的：探讨儿童肺炎支原体肺炎( MPP)发病的危险因素，为临床防治MPP提供依据。方法采用病例对照的研究方法，回顾性收集105例MPP病例和149例非MPP病例的资料，采用单因素和多因素logistic回归法筛选影响MPP发病的危险因素。结果单因素logistic回归分析结果显示年龄、反复呼吸道感染、特应性体质、不良生活环境、咯血、血沉升高、白细胞升高、IgM阳性、结节影、磨玻璃样影、斑片状实变影、树芽征等可能为MPP发病的危险因素。多因素logistic回归分析结果显示，年龄(OR=1.486)、反复呼吸道感染(OR=3.337)、IgM阳性(OR=2.524)、结节影(OR=3.673)、磨玻璃样影(OR=3.232)、树芽征(OR=8.199)等均为MPP发病的危险因素。结论年龄、反复呼吸道感染史、IgM阳性、早期X影像学异常结果等均为MPP发生的独立危险因素，应针对这些危险因素提出相应干预措施。
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