With the aging of the society, the change of modern life rhythm and diet, and the improvement of people’s living standard, the number of patients with constipation is increasing. Constipation seriously affects the quality of life of patients, and because of the limited help modern medicine can give for a long time, many patients with constipation rely on all kinds of laxatives all day long, and the abuse of laxatives leads to serious consequences such as colorectal melanosis, colitis, etc., and may even develop into malignant tumors. With the development of anorectal surgery, constipation has become one of the important components of modern anorectal surgery as a brand new discipline. However, because the etiology of constipation is complex, involving various factors such as neuroendocrine, gastrointestinal dynamics and pelvic floor anatomy, the correct diagnosis of constipation and the identification of the etiology of constipation are crucial to the clinical selection of treatment options, and special objective tests are needed for the diagnosis and typing of constipation, and then the selection of the corresponding treatment options. However, fecal imaging can only provide a diagnosis of large bowel outlet obstruction and cannot evaluate the function of the entire large intestine, and in a significant number of patients, outlet obstruction and slow colonic transport often coexist and are causal. Therefore, in a comprehensive evaluation of a patient with constipation, the colonic transport test should be included in order to have a clearer understanding of the anatomical morphology and function of the colon, which is an important reference for confirming the diagnosis and selecting the appropriate surgical plan. It provides a powerful help for the development of the discipline and brings a blessing to the majority of patients.