Objective：To observe the clinical effect of Huaiqihuang granules combined with montelukast for child cough variant asthma(CVA)and the effect on level of helper T cell 17(Th17)in serum.Methods：Divided 100 cases of patients with CVA into two groups randomly according to random number table，50 cases in each group.The control group was treated with montelukast，and the study group was given Huaiqihuang granules combined with montelukast.The course of treatment was both one month.Observed and compared the differences of the clinical symptoms，lung function[forced expiratory volume in 1 second(VFEV1)，ratio of VFEV1to forced vital capacity(FVC)(VFV1/FVC)，Th17 in serum，and levels of CD4+CD25+regulatory T cells of children in the two groups before and after treatment as well as the clinical effect and adverse reactions in the two groups.Results：The total effective rate was 96.0%in the study group and 80.0%in the control group，compared the two groups，difference being significant(P＜0.05).After treatment，the disappearance time of cough and phlegm，disappearance time of dry and wet rales，recovery time of body temperature and hospitalization time of children in the study group were all shorter than those in the control group，difference being significant(P＜0.05).After treatment，the values of VFEV1and VFV1/FVC in the two groups were increased when compared with those before treatment(P＜0.05)；the increase of VFEV1and VFV1/FVC values in the study group was more significant than that in the control group(P＜0.05).After treatment，the values of Th17 in the two groups were decreased when compared with those before treatment(P＜0.05)；the values of CD4+CD25+HighTreg were increased when compared with those before treatment(P＜0.05)；the improvement of the indexes mentioned above in the study group was more obvious than that in the control group(P＜0.05).The incidence of adverse reactions was 2.0%in the study group and 4.0%in the control group，and there was no significant difference being found in the comparison of the two groups(P＞0.05).During the follow-up of 6 months，the recurrence rate was 6.0%in the study group and 24.0%in the control group，compared the two groups，difference being significant(P＜0.05).Conclusion：The application of Huaiqihuang granules combined with montelukast has significant effect in treating child CVA.It can evidently improve lung function and immune function in children and has a low recurrence rate.