Gastric cancer surgery includes traditional open surgery, laparoscopy-assisted surgery, complete laparoscopy surgery and robotic surgery. The specific operation time is related to the operation style and patient’s condition, and the overall operation time is about 3-4 hours, as follows: 1. traditional open surgery: the operation time is about 2-3 hours; 2. laparoscopy-assisted surgery and complete laparoscopy surgery: the operation time is about 3-4 hours; 3. robotic surgery: gastric cancer surgery is completed by robot, and the general operation time is about 4-5 hours.