Esophageal examination mainly includes the following methods: First, barium meal esophagogram, the subject needs to take the contrast agent orally first, wait for a few minutes with X-ray examination, the overall structure of the esophagus to examine the contour, morphology, etc., in order to exclude the possibility of esophageal bleeding, stenosis, occupying lesions, etc.; Second, esophageal endoscopy, endoscopy is the most direct and accurate means of diagnosing diseases of the esophageal system Endoscopy is the most direct and accurate means of diagnosing diseases of the esophageal system. By using a fiber catheter with an endoscope to enter the patient’s esophageal lesion, the size, shape, and extent of the lesion can be carefully and clearly observed. If necessary, biopsy of the lesion tissue can be performed to clarify the type of disease, pathological stage and other information of the patient.