Fasting preparation and enema preparation are needed before barium meal examination. 1. Fasting preparation: Before preparing for barium meal examination, patients need to fast for at least 8 hours or more to keep the stomach in a state of emptying, so as to facilitate clinical observation after barium meal enters the stomach. If the fasting is insufficient, the gastric contents attached to the stomach wall may be treated as a mass during the barium meal X-ray examination, which may lead to misdiagnosis. 2. Preparation of enema: When patients need to observe the small intestine or colon, they need to prepare for enema. Fasting alone is not enough, and fecal matter may be stuck in the folds of the intestinal mucosa and cannot be discharged in time, so they need to take an enema to clean up the intestinal tract, so as not to affect the observation effect. Clinical barium meal examination is an important means of checking the esophagus, stomach, duodenum lesions, barium will not be absorbed by the stomach and intestines, in the X-ray can be very good observation of the esophagus, stomach and duodenum whether there is a filling defect, in order to better examination, so barium meal must be well prepared before.