Abstract: Objective:To investigate the mycoplasma pneumoniae(MP) infection complication status and clinical features of extrapulmonary.Methods:115 cases of MP in hospital pediatric infections in children.from September,1996 to October,2000,of which 15 cases of complications in children as a retrospective analysis are Screened out.Results:The concurrent nine cases of Kawasaki disease,60%(9/15) having fever longer than 5 days,6 cases of eye conjunctival hyperemia,chapped lips,neck lymph nodes,systemic erythema multiforme,the perianal flushing peeling.Two cases of palmoplantar erythema,the perianal flushing peeling.only 1 cases the showing coronary artery dilatation by B ultrasound.One case transferred outside,the rest were "azithromycin","aspirin" and "gamma globulin"cured;concurrent four cases of acute infectious mononucleosis syndrome(referred to as the IM),26.6%(4/15) had fever,swollen lymph nodes,angina.Three cases had liver and spleen enlargement.One cases had systemic scarlet fever rash.ALL were cured by using "azithromycin";concurrent Mycoplasma pneumoniae associated nephritis were in two cases,accounted for 13.3%(2/15),The two cases had edema and hematuria.All were cured by using Azithromycin for anti-MP combined with symptomatic treatment.Conclusion:A variety of extrapulmonary complications are cause by MP infection.Kawasaki disease accounted for the majority of 60%(9/15).Various types of complications have the corresponding clinical features and specific treatment programs.Clinicians in the treatment of Mycoplasma pneumoniae infection in children are to be highly vigilant to extrapulmonary complications,in order to avoid being missed or misdiagnosed,missing the timing of treatment,caussing serious consequences.