To observe the clinical effect of Xingsu Erchen tang combined with western medicine therapy for chronic bronchitis of wind-cold type in acute attack stage.MethodsEnrolled 70 cases of patients with chronic bronchitis of wind-cold type in acute attack stage into the clinical research，and divided them into the observation group and the routine treatment group randomly according to the sequence of admission，35 cases in each group.Both groups receivedthe routine and symptomatic treatment，as the routine treatment group received ambroxol while the observation group additionally received Xingsu Erchen tang.The treatment of both groups lasted for twenty days.Observed the changes of Chinese medicine syndrome scores and indexes of pulmonary function[forced expiratory volume in 1 second(FEV1)，the percentage of forced expiratory volume in 1 second in the expected value(FEV1%)，forced vital capacity(FVC)，the ratio of forced expiratory volume in 1-second to forced vital capacity(FEV1/FVC)]of both groups before and after treatment，and compared its clinical effect.Results：After treatment，the total effective rate was 68.57%in the routine treatment group and 94.29%in the observation group，difference being significant(P ＜ 0.05).Each scores of Chinese medicine syndrome(cough，expectoration，wheezing，color and texture of phlegm，nasal obstruction，aversion to cold，fever)and the total score in both groups were lower than those before treatment(P ＜ 0.05)，and each scores of Chinese medicine syndrome as well as the total score in the observation group were lower than those in the routine treatment group(P＜0.05).Each index of pulmonary function[FEV1，FEV1%，FVC，FEV1/FVC]in both groups was higher than that before treatment(P＜0.05)，and each index of pulmonary function in the observation group was higher than that in the routine treatment group(P＜0.05).Conclusion：Xingsu Erchen tang combined with western medicine therapy for chronic bronchitis of wind-cold type in acute attack stage can effectively release clinical symptoms，improve pulmonary function and enhance clinical effect.