There are many postoperative complications of gastric cancer, such as postoperative bleeding, dumping syndrome, intestinal obstruction and malnutrition. 1. Postoperative bleeding: this complication usually occurs within 24 hours after surgery, mainly due to the bloody liquid in the drainage tube, if the amount is large or more than 4 hours, and the bleeding is more than bleeding, surgical hemostasis should be given. The anastomosis formed during the surgery is also prone to bleeding manifestations. 2. Dumping syndrome: it is a special complication mainly caused by the patient’s postoperative overfeeding, which leads to the symptoms of vomiting or electrolyte disorders. 3. Intestinal obstruction: this situation may occur in all gastric cancer surgeries, which is related to postoperative intestinal adhesion, and the patients will have symptoms such as stopping defecation, defecation as well as nausea and vomiting. 4. Malnutrition: it belongs to a kind of long-term complication, which is mainly caused by the lack of nutrition due to the obstacle of nutrient absorption caused by too much gastric resection, and prolonged malnutrition will easily cause anemia and other phenomena. After surgery, stomach cancer patients may have other complications, so they should be given good nursing care, and at the same time, they should be closely observed and go to the hospital for rechecking on time, and if complications are found, they need to be dealt with in time.