[Methods] This study was a prospective, randomized, open-label, controlled study to evaluate the effectiveness of OK-432 pleurodesis of persistent air Leak after pulmonary Resection. The adult patient have persistent air leak >48 hours after thoracic surgery, will randomized to OK-432 pleurodesis (OK-432 group) or normal saline pleurodesis (NS group). The trial will be conduct from May 25, 2015 to May 25, 2018 in the Department of Surgery at national Taiwan University Hospital, a medical center. The study protocol was approved by the hospitals' Institutional Review Boards. A total of 80 cases, the subjects will be the hospital thoracic surgery ward and received outpatient programs. Eligible Subjects : adults (minimum age> 20 years; maximum age ≦ 70 years old) patients with thoracic surgery and over48 hours of continuous air leak. The exclusion criteria include: penicillin allergy,primary pneumothorax, esophageal cancer, immune dysfunction, those who can not sign a consent form, and pregnant or lactating, other serious concomitant illness such as uremia or liver cirrhosis. Study steps: eligible Patients will randomize according to computer-generated random numbers, with 1:1 ratio in sequentially numbered, sealed envelopes by a study nurse who was masked to the study. Randomization envelopes were opened, and randomization was performed by the study nurse after informed consent was obtain. Eligible inpatients were randomized to the OK-432 group or the normal saline (NS) group，each group are 40 cases.