The microwave tissue coagulator was originally used for hemostasis in the hepatic surgery, which is effectively applied in the endoscopic surgery such as the hemostasis of gastric ulcer or tumor bleeding, stenosis relieving of esophageal or rectal stenosis and tumor reduction in inoperable early cancer cases. We experienced the good result of the microwave tissue coagulation therapy in the patient with the restenosis of esophagogastrostomy. The patient was 67 year-old female, who was admitted due to the lye stricture of esophagus for 40 years. We made the lower esophagectomy and the esophagogastrostomy with the upper intact esophagus in the right thorax. But the restenosis occurred at the esophagogastrostomy site because of the polypoid mucosal protrusion at one month after operation. We applied the microwave tissue coagulator 3 times with 6 day interval under esophagoscopy and the good symptomatic and endoscopic relief was alleviated. We think that the microwave tissue coagulation is a very convenient and advisable method in the case of restenosis after esophageal surgery.