Duodenal diverticulum requires consultation with gastroenterology department, and barium X-ray examination, duodenoscopy, cholangiography and CT examination are needed to confirm the diagnosis. 1. Barium X-ray examination: Duodenal diverticulum can be found as a diverticulum protruding from the contour of the intestinal wall, with a large shadow remaining in the diverticulum lumen, and sometimes a gas-liquid surface can be seen. 2. Duodenoscopy: it can find the diverticulum outside the opening, understand the relationship between the diverticulum and the duodenal papilla, and provide an accurate basis for the surgical program. 3. Cholangiography: it can be examined by intravenous cholangiography, retrograde cholangiography via duodenoscopy, etc., to understand the relationship between the diverticulum and the bile duct and pancreatic duct, which is of reference significance for the treatment method. 4. CT examination: it can show that the positive contrast shadow that enters into it contains gas shadow in addition. If the duodenal diverticulum exists certain clinical symptoms, need to timely gastroenterology diagnosis and treatment.