Objective:To evaluate the interventional effects of Yufeining on lung function in patients with chronic obstructive pulmonary disease (COPD). Methods:38 patients with COPD were divided into therapeutic group (20 cases) and control group (18 cases) randomly. Therapeutic group was treated with oral Yufeining pill half a year and then was followed up 6 months without drug. Control group was not given any medicine during the observed one year. Routine lung function was measured at before 、6 months and 12 months after treatment. Total symptom score (TSS) of traditional Chinese medicine、the scores of quality of life (QOL) were recorded simultaneously. Blood gas analysis was measured only at before and 6 months after. Results:FEV 1 was 1 032?0 336L after 6 months treatment in therapeutic group, while FEV 1 was 0.982?0.353L before treatment (P