Tumor causing gastrointestinal obstruction is a common problem, which manifests as abdominal distension, abdominal pain, vomiting, and cessation of defecation. The treatment plan should be based on the extent of tumor and the general health condition of the patient. 1. Reconstructing a clear digestive tract after removing the tumor is the best way to solve the obstruction problem. Obstruction has great influence on health condition and ability to tolerate surgery. Therefore, tumor resection and GI reconstruction should be completed at one time after relieving obstruction by gastric tube or jejunal decompression tube as much as possible before surgery. In most cases, the application of gastric tube decompression can achieve better results, and if necessary, the application of endoscopic-assisted jejunal decompression can eliminate the fluid and gas accumulation in the small intestine faster and better, see our academic paper (Abdominal Surgery 2011, Vol. 24, No. 3) for this part. 2. For colonic obstruction, the obstruction can also be relieved by placing a gastrointestinal stent, followed by a one-time surgery, (see our academic paper: Chinese Journal of Endoscopy 2011, No. 12). In cases where the patient is too ill to tolerate radical surgery and the previously described methods of relieving the obstruction have not worked, a stoma can be performed first and then the tumor resection can be performed again when the condition improves. If the physical condition can tolerate the surgery, emergency surgery can be performed to remove the tumor and reconstruct the digestive tract; in case of heavy intestinal edema, stoma can be made after removing the tumor and the digestive tract can be reconstructed by surgery again to reduce the risk of digestive fistula after one-time surgery. 3. These obstructions that can be solved by surgical removal of the tumor, although the best choice of surgical plan needs to be decided by integrating many factors, it is not particularly difficult to release the obstruction problem regardless of which method is used. In patients with advanced tumors, which are often not amenable to surgery, the management is much more complicated. Relief of abdominal pain and distention from intestinal obstruction generally requires long-term transnasal gastric and intestinal decompression therapy. However, this method leads to intolerable nasal and pharyngeal discomfort while reducing abdominal distension. For this condition, endoscopically assisted minimally invasive drainage gastrostomy and enterostomy can be applied to manage the situation.