To test the hypothesis that nebulized Pulmicort Respules could reduce post operation pulmonary complication incidence in primary lung cancer patients with COPD. Compare post-operation pulmonary complication incidence in two treatment arms among primary lung cancer patients with COPD required single lobectomy from 3days before operation to 7 days after operation.

Inclusion Criteria:

1. Newly diagnosed or existing COPD defined by GOLD, and FEV1 of<80% predicted and FEV1/FVC<70%
2. Diagnosed as primary lung cancer by China guidelines on diagnosis and treatment of primary lung cancer
3. .Consistent with indication of operation of pulmonary single lobectomy surgery by China guidelines on diagnosis and treatment of primary lung cancer
4. General anesthesia and double cavity intubation was used during operation
5. ASA Classification of Anesthesia Risk is in category 1-3 both in baseline
6. age from 40-80 years old
7. Smoking cessation more than two weeks before operation
8. SP O2>90% before surgery
9. Hemoglobin > 10g/dl
10. Estimated duration of surgery < 4 hours
11. 18.5\