Colonoscopy is an important method used clinically to check whether the intestine is accompanied by lesions. Generally, whether bowel obstruction can be detected based on the patient’s colonoscopy is objectively analyzed based on the specific parts of the patient’s intestinal obstruction. First, if the patient is accompanied by colonic neoplastic lesions, with the growth of tumor cells causing intestinal lumen narrowing. Through colonoscopy, not only the specific site of intestinal obstruction can be clarified, but also the specific nature of intestinal lesion can be clarified through local biopsy under colonoscopy, which can provide important basis and plan for the next surgical treatment. Second, if the plane of intestinal obstruction is higher in the jejunum or ileum, only the lesions of the colon and rectum can be clarified through colonoscopy, and the site and cause of small intestinal obstruction cannot be found. For patients with small intestinal obstruction, clinically, it can be combined with abdominal enhancement CT examination to clarify the site and specific cause of obstruction, which can achieve better results.