Barium meal is a kind of radiological examination, when the examination will use barium sulfate as a contrast agent, mainly used to determine whether there is a digestive tract disease, can also be used for heart disease examination, the examination with barium sulfate powder mixed with water to make a paste and swallowed for fluoroscopy. Barium sulfate is not absorbed by the human body and can prevent the passage of X-rays. When doing fluoroscopy, the passage of barium in the digestive tract can be used to determine whether there is any disease. Peptic ulcer is a niche formed by the retention of barium sulfate in the defect of the stomach wall or intestinal wall, and barium meal is also used in the triple phase examination of the heart to observe whether there is heart enlargement compressing the esophagus.