The knee-chest position is generally used to check for anal and intestinal diseases, such as hemorrhoids, rectal tumors, polyps, and so on. Knee-chest position, the anus is elevated, at this time you can check the anus of diseases, such as hemorrhoids, anal fissure, etc.; at the same time, the abdomen down, can be convenient for proctoscopy, used to detect rectal ulcers, polyps, tumors and so on. Knee-chest position first to empty the urine, after loosening the belt, both knees kneeling on the bed, the two calves flat on the bed slightly apart, take the head and chest low, the body leaning forward, the buttocks lifting posture, the chest should be as close as possible to the bed, the patient’s thighs and the bed perpendicular to the abdominal suspension, the buttocks lifting purpose. This position on the patient’s strength requirements are higher, many patients are difficult to cooperate, so the current clinical clinical use is less, such as anal examination has been mostly truncated position; proctoscopy is mostly used in the left lateral recumbent position. The examination requirements of different diseases are different, should comply with the requirements of the physician to cooperate with the examination.