Stimulation of anal defecation with soap is mainly used for the treatment and symptomatic improvement of long-term, persistent constipation. Patients who have very severe constipation that cannot be discharged and do not want to take a laxative that stimulates the bowel to discharge stools often use soap and other foreign objects to carry out anal stimulation, mainly through the lubrication of the soap later, polished into a cylindrical state, and then to the anus and the anus inside the slight lubrication and friction stimulation, which causes a reflex of defecation and a refusal of defecation. This causes a defecatory reflex. This situation can be used occasionally, long-term use of constipation treatment and symptomatic improvement is not beneficial, because the formation of habitual conditioned reflexes, easy to lead to have a dependence on soap, making it more difficult to discharge the stool, any treatment for constipation must be intermittent, can not form a complete dependence, otherwise the subsequent treatment or habitual, conditioned reflexes to improve, will be extremely difficult.