Usually the fastest way to detect small bowel cancer does not exist, and patients can be examined by abdominal CT, barium gastrointestinal imaging, capsule endoscopy and so on. Due to the clinical rarity of small bowel cancer and atypical symptoms, it is easy to be misdiagnosed and missed in clinic. 1. Abdominal CT: if the wall of small intestine is irregularly thickened, the mucosal surface is not smooth, soft stenosis can be formed locally, and the surface of plasma layer is not smooth and the density of neighboring fat layer increases when the plasma layer is invaded, then small intestine cancer can be suspected, and further examination should be carried out. 2. Barium gastrointestinal imaging: patients can undergo barium gastrointestinal imaging to show the location and scope of small intestinal diseases, which can be manifested as localized mucous membrane damage, loss of circular folds, intestinal filling defect, narrowing of intestinal lumen and so on. 3. Capsule endoscopy: capsule endoscopy is only the size of a paperclip, when the examination, the patient only needs to swallow the capsule endoscopy like swallowing a drug capsule, wearing a data logger undershirt, after the doctor’s test to confirm that the capsule enters the small intestine, you can leave the hospital, the whole examination process takes 8 to 10 hours, after the examination, the capsule from the anus to discharge itself. In addition, patients can also check for small bowel cancer by means of small colonoscopy, etc. However, small colonoscopy is difficult to operate and is not popularized at present. If small bowel cancer is highly suspected clinically, it should be actively perfected and treated after diagnosis.