Anal muscle relaxation is usually analyzed by considering increased rectal secretion, constipation, anal surgery or the patient’s physical condition. 1. Increased rectal secretion causes anal moisture, which in turn will stimulate the perianal skin causing anal relaxation and even rectal prolapse. 2. Constipation usually causes dry stools and long defecation time, thus causing anal sphincter damage and relaxation. 3. Damage to the body’s anal sphincter due to surgery can also cause anal muscle relaxation. 4. A large part of the population is the decline in function of the elderly frail, the anal sphincter function is damaged, easy to appear incontinence. In short, the causes of anal muscle relaxation are varied, the emergence of a more serious situation should be timely medical diagnosis, according to different conditions to give the appropriate treatment, to avoid aggravation of the condition, affecting the normal life.