Esophageal cancer is a common malignant tumor of the digestive tract, and China is a country with high incidence of esophageal cancer, and more than half of the 300,000 patients who die of esophageal cancer every year in the world are Chinese. The onset of esophageal cancer is insidious and the malignant degree is high, and patients are often in the progressive stage at the time of diagnosis, and sometimes other parts of the esophagus are found to be invaded only during the operation and radical resection is not possible, so the overall 5-year survival rate of esophageal cancer has been hovering around 10% for a long period of time.