Since 2004, I pioneered the use of continuous negative pressure drainage through the fistula to treat postoperative anastomotic fistula (internal drainage method) for esophageal cancer, at least hundreds of patients have benefited from ① early application for faster healing, lifting the drainage tube 6cm from the fistula as soon as possible ② diligent observation and adjustment, weekly fluoroscopy ③ negative pressure should be continuous ④ as the drainage flow changes from more to less negative pressure should be small to large, from 10-20kpa ⑤ after the drainage flow is gone, the negative pressure should be maintained for another week ⑥ each time the pressure is withdrawn to withdraw the tube 1cm/2 days