Abstract: Objective： To investigate the effects of bailing capsule combined with montelukast sodium on lung function and immune function in children with cough variant asthma. Methods： 100 patients were randomly divided into control group and observation group， 50 cases each. Montelukast sodium， bailing capsule combined with montelukast sodium were given respectively in the two groups for 8 weeks. The time of symptom relief， pulmonary function and immune function before and after treatment were observed， and the clinical efficacy and the rate of adverse reaction of the two groups was compared. Results：The total effective rate was 95.9% (47/49) in the observation group and 80.9% (38/47) in the control group (P<0.05). The symptom remission time in the observation group was improved compared with the control group (P<0.05). The lung function and immune function of the two groups were improved after treatment (P<0.05)， and the improvement degree in the observation group was better than that in the control group(P<0.05). Conclusion：Bailing capsule combined with montelukast sodium can effectively improve the pulmonary function and immune function of children with cough variant asthma.