The normal size of the pancreas is 10-20cm in length, 3-5cm in width, and 2.5cm in thickness.The average weight of the pancreas in normal people is 75-125g.It is located in the posterior peritoneum in front of the 2nd lumbar vertebrae.In front of it is the stomach, the duodenum surrounds the head of the pancreas, and the anatomical structure underneath it is the intestinal tract, and on the left side of it is the spleen, and the tail of the pancreas is in the splenic hilum, and the pancreas is in a position that makes its relationship with other organs very close. Disease can cause multi-organ dysfunction. There are blood vessels around the back of the pancreas, which makes surgery more difficult. There is a thick splenic vein and blood-rich splenic artery at the back, and the splenic vein and a larger vein in the mesentery converge to form the portal vein, which is intertwined with each other. Therefore, pancreatic surgery is more demanding, and damage to blood vessels should be avoided to avoid unnecessary complications. At the same time, the pancreas is a digestive organ, lesions can cause digestive insufficiency, and insulin is secreted by the pancreas, if the pancreas is removed more than one, resulting in low insulin secretion leading to diabetes, try to retain the pancreas during surgery.