To study the clinical effect of Modified Sanzi Yangqin Decoction in the treatment of chronic obstructive pulmonary disease at the stable stage.Methods:A total number of 60 patients with chronic obstructive pulmonary disease who received treatment from December to January 2013 in the hospital were selected. The control group was treated with routine therapy,while the observation group was additionally treated with Modified Sanzi Yangqin Decoction on the basis of the control group. Pulmonary function indicators,symptoms and signs of the treatment,CAT score after treatment and treatment efficacy of patients in the two groups were observed.Results:FVC,FEV1 of the observation group (2.23±0.57,1.60±0.35) L was higher than that of the control group (1.93±0.51,1.28±0.49)L. The difference was statistically significant (P<0.05). Symptoms like cough,expectoration,stomach,wheezing and rale of the observation group were much more relieved compared with the control group with statistically significant difference (P<0.05). CAT score of the observation group (6.70±1.21) was less than that of the control group (15.28±2.82),which showed that the difference was statistically significant (P<0.05). Total effective rate of observation group was 93.33% (28/30),better than that of the control group of 70.00% (21/30). The difference was statistically significant (P<0.05). Conclusion:Modified Sanzi Yangqin Decoction in treating patients with chronic obstructive pulmonary disease at stable stage has good curative effect and can improve the patient’s condition.