Once the patient’s condition is stabilized after abdominal surgery, it is recommended that the patient take the semi-recumbent position. There are several reasons: First, semi-recumbent position is conducive to the patient’s abdominal surgical wounds of inflammatory exudate and blood flow into the pelvic cavity under the effect of gravity, can be pre-positioned through the pelvic drainage tube, the inflammatory exudate out of the body. Moreover, the pelvic peritoneum absorbs the toxins in the inflammatory exudate slowly, which can avoid a large amount of toxins being absorbed into the blood faster, causing infectious shock of the patient. Semi-recumbent position can effectively reduce the accumulation of inflammatory exudate under the diaphragm or between the intestines, thus avoiding the occurrence of abscess between the intestines or under the diaphragm. Third, semi-recumbent position is conducive to the downward movement of the diaphragm, avoiding the lungs ventilation and ventilation function is affected. Fourth, semi-recumbent position is conducive to reducing the tension of the abdominal wall incision, avoiding the local blood circulation is affected, resulting in delayed healing of the incision and causing serious complications.