Objective To explore the correlation between mycoplasma pneumonia (MP),chlamydia pneumoniae (CP) and asthma index as a predictor of positive.Methods We separated 120 received infants who suffered from the asthmatic respiratory disease (included the bronchitis convulsive and asthmatic pneumonia).We separated the infants into experimental group i.e.predictive index for positive group (62 infants) and control group i.e.predictive index of negative group (58 infants),and we checked the MP-IgM,CP-IgM of the two groups of infants and compared the groups.Results 15 infants of the experimental group had the positive MP-IgM and the positive rate was 24.2%.18 infants of the experimental group had the positive CP-IgM and the positive rate was 29%.And the relative positive rate of the control group was 8.6% and 12.1%.The discrepancy of two group had statistical significant difference (P<0.05).Conclusion MP,CP have some relation with the asthma index as a predictor of positive.We need to improve the related specific antibody detection,and to macrolides in treatment of acute asthmatic attack in order to decrease incidence of asthma disease in school age children. Key words: Mycoplasma pneumonia(MP); Chlamydia pneumoniae(CP); Predictive index for positive children asthma