Two months after rectal cancer surgery, there is a little effusion out of drainage tube, which may be caused by poor venous and lymphatic reflux in abdominal cavity and existence of intestinal fistula after surgery, or it may be caused by secondary intra-abdominal infection after surgery, and if there is still effusion discharged out of the drainage tube, the drainage tube can not be pulled out. If the tissues resected in rectal cancer surgery are extensive, the venous vessels and lymphatic vessels in the resected area are missing, the blood and lymphatic return of the surrounding tissues are not smooth, or the postoperative intestinal anastomosis is poorly healed, and intestinal fistula occurs, which leads to localized exudate and leakage of fluid in the surgery, at this time, it is still necessary to use drain tube to drain, so as to avoid the localized accumulation of exudate leading to a large amount of fluid accumulation in the abdominal cavity. In addition, the surgery itself is also a kind of trauma, after the surgery, the patient’s body is weak, resistance decreases, easy to get infected, inflammation will also cause local inflammatory edema and oozing, causing abdominal fluid accumulation. Two months after the operation, there is still fluid coming out of the drainage tube, you should promptly or regularly consult the doctor to review the abdominal ultrasound and CT, to observe the postoperative recovery, do not blindly remove the drainage tube, so as not to affect the postoperative recovery.