Because laparoscopic colorectal surgery is completed under the TV monitor to separate the intestines, clear the lymph and remove the tumor, it has the following advantages: (1) less interference with abdominal organs; (2) no need to use surgical hooks to pull the abdominal wall, so the trauma to tissues is light; (3) no need to touch and squeeze the tumor, to avoid the risk of metastasis of the tumor; (4) the laparoscope has a magnifying effect, so that the surgical field of view is clearer, the vascular anatomy and lymph node clearance is more accurate, and the surgical bleeding is less; (5) the emergency reaction after the surgery is light, and the body’s immune system is less disturbed. (4) Laparoscopy has a magnifying effect, which makes the surgical field clearer, the vascular anatomy and lymph node dissection more accurate, and the surgical bleeding is less; (5) The emergency reaction after surgery is light, and there is little interference with the immune system. Due to the above reasons, after laparotomy, patients have less pain, get out of bed earlier, recover gastrointestinal function faster, have shorter hospitalization time, fewer cardiovascular and cerebrovascular complications, have smaller wounds, less psychological trauma, recover quickly and return to work earlier. The follow-up of large number of cases at home and abroad shows that laparoscopy and traditional surgery are also better than traditional surgery in terms of post-operative complications, tumor recurrence, distant metastasis and five-year survival rate. Colorectal cancer (colorectal cancer) surgery: how to choose between laparoscopic and open? ① Laparoscopic over-obese patients have relatively small space in the abdominal cavity and pelvis, and the small intestine or large intestine can easily block the surgical field, and it is more difficult to expose the surgical field. It is better to perform open surgery for over-obese patients; ② Larger or later colorectal cancer (colon cancer, rectal cancer), or narrowing of the intestinal lumen so that the colonoscope can not pass, or intestinal obstruction, suggesting that the tumor is large, and the tumor often infiltrates beyond the plasma membrane, and pneumoperitoneum in laparoscopic surgery may cause the proliferation of tumor cells, and it is not recommended to perform laparoscopic surgery. The tumor is large and the surrounding space is relatively small, also not conducive to laparoscopic surgical field exposure and separation, laparoscopic surgery is not recommended. The 4 contraindications of laparoscopic surgery for colon cancer Not all patients are suitable for oh! Although colon cancer laparoscopic surgery has the advantages of clear operation field, less bleeding, less trauma and less pain compared with open surgery, not all patients are suitable for this kind of surgery. 1.Diseases that tolerate prolonged pneumoperitoneum (e.g. serious cardiopulmonary disorders and infections) Laparoscopic colon surgery tends to have a wide range of free range, and it is often necessary to change the body position several times during the operation before the freeing of resected intestinal segments can be completed. Excessive adjustment of body position, coupled with continuous pneumoperitoneum pressure, increases the resistance to vena cava return, elevates the diaphragm, and restricts cardiopulmonary activity, leading to hemodynamic changes. 2. Conditions that lead to uncontrollable bleeding (e.g., portal hypertension, coagulation disorders, etc.) Coagulation disorders can lead to uncontrollable intraoperative bleeding both for open and laparoscopic surgery. Laparoscopic surgery is particularly sensitive to bleeding, and a very small amount of bleeding can result in reduced visual field brightness, unclear anatomical levels, and blurred fields. Therefore, common coagulation disorders, such as portal hypertension, should be treated in time and corrected preoperatively as much as possible to reduce the risk of surgery. 3, technical limitations (pathological obesity, extensive intra-abdominal adhesions, combined with intestinal obstruction and pregnancy, etc.) Many contraindications to laparoscopic technical limitations is a relative concept, it is difficult to define pathological obesity, obesity into the contraindication is because of obese patients laparoscopic surgery space is limited to reveal the anatomical level is not clear, some important structural markers of the identification of the difficulty of the skills of the operator and the comprehensive ability to analyze the professional requirements of high. The operator’s skills and comprehensive ability of professional analysis are required. Tumor invasion into adjacent tissues and organs, such as ureter, bladder and small intestine, etc. Late-stage tumors have invaded adjacent organs, such as ureter, bladder, small intestine, duodenum, etc. Surgery has lost the significance of radical treatment. However, palliative resection of the cancer should still be strived for to reduce the consumption of the body by the cancerous tumor and to prevent bleeding and obstruction. Surgery is difficult because it involves resection or even reconstruction of neighboring organs, so it is generally not advocated to be performed under the laparoscope.