Difficult and laborious defecation, incomplete defecation, constipation, anal and small abdominal cramps and discomfort, anal cramps, poor or disordered urination, these conditions bring endless troubles and distress to patients. In addition to the common clinical conditions of proctocolitis, anal sinusitis, rectal and pelvic occupations, a large part of them are also related to pelvic floor dysfunction. Unlike common anorectal diseases that can be cured by surgery, many patients with these diseases are uncertain about the effect of medication and cannot be seen with surgical treatment. Also, pelvic floor dysfunctional disorders cannot be equated or categorized as anorectal neuroses. Knowledge of the pelvic floor may be helpful in the understanding and treatment of these disorders. I. What is the pelvic floor? What is its role? The pelvic floor system is all the tissues that close the lower pelvic opening. Its fascia, muscles, ligaments and other tissues and organs are interwoven through fibers to support the organs against abdominal pressure, and play an important role in the normal exercise of the body’s functions such as defecation, urination and childbirth. When the pelvic organs around the muscles, nerves, blood vessels and other abnormalities, will cause pelvic floor dysfunctional diseases. Second, what are the pelvic floor functional diseases related to defecation disorders in anorectology? 1.Pelvic floor relaxation syndrome includes perineal descent, rectal prolapse, rectal mucosal relaxation, rectal protrusion, etc. Its clinical manifestations are anorectal swelling, frequent bowel movements, feeling of unclean bowel movements or thinning of stool strips, and in severe cases, hand squeezing around the anus or vagina is needed to assist defecation. 2, pelvic floor spasm syndrome, including the puborectal muscle spasm syndrome, internal sphincter loss delay syndrome, its clinical manifestations are defecation difficulties, is progressively aggravated, the stool is dry and hard, long bowel time, the more forceful defecation discharge more difficult. Third, what are the causes of pelvic floor dysfunction? 1, pelvic floor support structure relaxation. Long-term high abdominal pressure can cause damage to the pelvic floor nerve and muscle strains, common factors such as: pregnancy, childbirth, surgery, obesity, smoking, constipation, etc. 2, the pelvic floor local tissue self-repair ability decreases. As age increases, hormone levels decline, especially estrogen secretion decreases and causes local tissue can not be effectively repaired, if combined with high abdominal pressure can aggravate the occurrence of pelvic floor disease.