The partial or complete downward displacement of the rectal wall is called rectal prolapse, so rectal prolapse is generally divided into two types. Type I: incomplete rectal prolapse, i.e. rectal mucosal prolapse. The mucosal layer of the rectum is prolapsed outside the anus, and the prolapsed object is hemispherical, and the mucosal groove of the ring centered on the rectal cavity is visible on its surface. Type II: complete prolapse of the rectum, i.e., total prolapse of the rectum. The prolapsed rectum is conical in shape, and the prolapsed part can be arranged in concentric rings of mucosal grooves centered on the rectal lumen. Type II is divided into three degrees according to the degree of prolapse: degree I is intestinal sleeve in the rectal jugular, that is, occult rectal prolapse. The fecal imaging shows an umbrella-shaped shadow. Degree II is prolapse of the entire rectum outside the anus, with normal position of the anal canal, normal function of the anal sphincter, and no anal incontinence. Grade III is prolapse of the rectum and part of the sigmoid colon and anal canal outside the anus, with impaired function of the anal sphincter and incomplete or total anal incontinence.