Objective:To observe the efficacy of modified Jiubaowan in the treatment of post-infection cough in child with anemogenous phlegm accumulated in lung. MethodsAccording to the degree of cough severity, 200 subjects were randomized into the treatment group with mild symptom, control group with mild symptom, treatment group with severe symptom, control group with severe symptom. Modified Jiubaowan was applied in the two treatment groups,while leukotriene receptor antagonist in the two control groups,with a course of 14 days. The clinical efficacy was observed and the scores of TCM syndrome were compared.  Results:①Among the patients who complete the whole test,there were 47 patients in the treatment group with mild symptom and 46 patients in the control group with mild symptom;44 patients in the treatment group with severe symptom and 44 patients in the control group with severe symptom.②The total effective rate of treatment group with mild symptom was 85.11%,and control group with mild symptom was 86.96%. There was no statistically significant difference in clinical efficacy between these two groups (P>0.05). The total effective rate of treatment group with severe symptom was 75%,and control group with severe symptom was 56.82%. There was statistically significant difference in clinical efficacy between these two groups (P<0.05). ③In the two groups of mild symptom,compared with before treatment within groups,there was statistically significant difference in the score of TCM syndrome in both group after treatment (P<0.05); compared between groups after treatment,there was no statistically significant difference in the score of TCM syndrome(P>0.05). In the two groups of severe symptom,compared with before treatment within groups,there was statistically significant difference in the score of TCM syndrome in both group after treatment (P<0.05); compared between groups after treatment,there was statistically significant difference in the score of TCM syndrome(P<0.05).  Conclusion:Modified Jiubaowan showed good efficacy in the treatment of post-infection cough in child,which relieved cough symptoms, and it was more effective on severe cogh children.