1, 1-2 days before the examination stop taking impervious to X-rays or drugs that affect gastrointestinal function, such as bismuth subcarbonate, calcium gluconate. 2, 1 day before the examination eat less dregs easy to digest food, fasting after dinner. 3, gastric retention of the patient 1 night before the examination gastric lavage, the purpose is to remove the gastric contents, to facilitate the barium meal examination. 4.For the whole gastrointestinal barium meal examination, take 100g of barium sulfate powder at 2:00 a.m. on the examination day, and mix it with 200-300ml of warm boiled water. 5.Explain to the patient that the swallowed barium is not harmful to the body, it will not be absorbed and will be excreted with the stool after taking it. The white baked stool will be solved 1-2 days after the barium meal examination, so there is no need to be nervous. 6.This test is prohibited for pregnant women within 3 months.