Barium enema colonography, mainly used to diagnose colon diseases, the main process is to insert the anal tube into the anus, and then inject barium and conduct X-ray examination, so as to check out colon tumors, polyps inflammation and other diseases. Before doing barium enema colonography, there are several points of preparation that need to be noted: First, about two days before the imaging, iron, iodine, sodium and other drugs belonging to high density should not be taken. Second, the day before the imaging, you should try to eat less food containing fiber and difficult to digest. No breakfast should be eaten on the day of imaging. Fourth, the night before the imaging, eat food with less residue, such as soy milk, noodles, thin rice, etc. The first process of barium enema examination is oral laxative or cleansing enema to make the patient excrete the stool in the large intestine, so that the large intestine is in a clean state. Barium enema colonography, which can also be used to check intestinal inflammation and intestinal tumor.