Dampness and uncleanliness in the anorectal area is most often due to abnormal pelvic floor and sphincter function and anal incontinence. The function of the anorectum has a complex mechanism that includes the interaction of many different factors that allow defecation at any time with the ability to maintain self-control. Therefore, a particular examination may test one aspect of this mechanism, and clinical evaluation must be based on a combination of findings. Commonly used diagnostic tests to evaluate pelvic floor and sphincter function include: 1. Anorectal manometry: this includes the resting pressure controlled by the internal anal sphincter, the maximum pressure of the external sphincter during casual contraction, and the perceptual threshold of stimulation during diastole. In fecal incontinence anal resting pressure and maximum pressure are decreased. 2.Electromyography：It is an objective basis to reflect the physiological activities of pelvic floor muscles and sphincter to understand the site and degree of nerve and muscle injury. 3, fecal imaging: it can record the dynamic changes during fecal evacuation, and through the change of rectal angle, it can infer the state and damage degree of puborectal muscle. 4.Saline enema test: 1500ml of saline is injected into the rectum in sitting position, and the leakage and maximum retention volume are recorded to understand the self-control ability of defecation. The retained volume decreases or becomes zero in case of fecal incontinence. 5.Anal tube ultrasonography: it can accurately determine the site of anal sphincter defect and asymmetry measuring the thickness of the internal sphincter. Careful questioning and physical examination can identify the etiology of most fecal incontinence. Pre-treatment radiologic and physiologic tests can confirm the diagnosis, and relevant abnormalities of gastrointestinal function and detection of anal sphincter defects provide objective baseline information. Proctitis is a frequent disease, and the cause of proctitis is still unclear, mainly thought to be related to chronic inflammatory stimulation, schistosomiasis, hemorrhoids, anal fistula, anal fissure, suppurative sweating, benign tumors malignant, due to sexually transmitted diseases, diet and other factors.