There are three strictures of the esophagus: the first stricture, at the entrance of the esophagus, about 15 cm from the incisor, is generally of no specific clinical significance, mainly because some food and foreign bodies tend to get stuck in this position. The second stricture, 25-27cm from the incisor, is the second stricture of the esophagus, mostly at the position of the aortic arch and the sternal angle, as well as at the position of the tracheal bifurcation, which is of great clinical significance, and it is also easy to be embedded in this position for some cases of esophageal cancer or esophageal foreign bodies. The third stenosis is the location of the cardia at the junction of the esophagus and the stomach, which is often associated with advanced esophageal cancer and gastric fundus occupation, and surgery or esophageal stenting should be considered for advanced lesions.