Barium meal test is relatively accurate for diseases such as gastrointestinal tract occupying lesions and gastrointestinal ulcers, and less accurate for other diseases such as gastroenteritis. Gastrointestinal barium meal examination is to take barium orally and then, under the instrument, observe the passage of barium in the gastrointestinal tract, which can show organic lesions including esophagus, stomach, duodenum, small intestine and colon. For example, in gastric ulcer or gastric cancer, niche shadow can be found, and concentration of mucosal folds, such as esophageal cancer and gastrointestinal cancer can be found in barium meal filling defects. For gastroenteritis, chronic gastritis, esophagitis and other diseases, the mucosal organic changes of such diseases are not obvious, so barium meal examination is generally not accurate. In addition barium meal is contraindicated for those who suspect intestinal obstruction and gastrointestinal perforation, and for those who are allergic to iodine and barium sulfate. Barium meal examination for certain diseases, the accuracy is higher, it is recommended under the guidance of a professional doctor, reasonable and standardized examination and treatment.