The process of barium X-ray examination is as follows: 1. Barium meal of esophagus: take the barium sulfate solution prepared in advance and do different actions on the examination bed as requested by the doctor; 2. Barium meal of upper gastrointestinal tract: take the gas-producing powder orally to make the stomach fully distended, and then take the barium sulfate solution to form a double contrast contrast contrast image of gas and barium. Some patients need to do low tension gas-barium double contrast imaging, i.e. injecting anticholinergic drugs 15 minutes before the examination to keep the stomach in a low tension state; 3.Whole gastrointestinal barium meal: the same as gastric barium meal examination, which requires several times to fully display the complete small intestinal mucosa; 4.Barium enema: injecting the configured barium sulfate solution and gas into the rectum and colon through the anus to make the large intestinal mucosa visible.