Objective To probe into the clinical effect of Qingkailing injection in treating acute bronchitis.Method 80 cases of patients with acute bronchitis were divided into the experimental group and the control group randomly with 40 cases in each group.Patients in the control group were treated with penicillin and those in the experimental group were treated with Qingkailing injection.Results Total effective rate in the experimental group was 90.0% and that in the control group was 75.0%.The extinction time of cough

fever

asthma

pharyngeal hyperaemia

antiadoncus and lung rale in the experimental group were shorter than those in the control group and the differences were statistically significant（p<0.05）.Conclusion The curative effect of Qingkailing in remitting symptoms and sign of acute bronchitis is better than that of penicillin.