Anesthesia for gastric cancer surgery takes 2-4 hours, depending on the patient’s intraoperative condition. The time of gastric cancer surgery depends on the patient’s specific conditions, such as whether there is primary disease before surgery, whether the anesthesia is smooth, the intraoperative adhesion between the mass and surrounding tissues, whether lymph node metastasis occurs, the selected operation style, intraoperative bleeding and sudden circumstances. If the patient has good general condition, no underlying disease, light intraoperative tissue adhesions around the mass, no abnormal intraoperative bleeding, and smooth surgical progress, the intraoperative anesthesia time is relatively small and may be finished in more than 2 hours. If the boundary of the intraoperative mass is unclear and adheres to the surrounding tissues, or if the preoperative prognosis does not match with the actual intraoperative situation, the actual operation is more complicated, and if bleeding, blood pressure drops or other sudden situations occur during the operation, the actual anesthesia time is longer, and some patients may have 5-6 hours or longer. Therefore, the anesthesia time for gastric cancer surgery is only known in the light of the actual situation.