The extent of resection for pancreatic cancer surgery is actually divided into the extent of resection of the tumor in the head of the pancreas and the extent of surgical resection of the tail of the pancreatic body. The resection range of pancreatic head cancer is firstly the tumor, pancreatic head, duodenum, biliary tract and part of jejunum below. In fact, pancreatic tumors, like other tumors in the abdomen and most tumors, are prone to lymph node metastasis and nerve invasion, and should be resected from the lymph nodes of hepatoduodenal ligament below the liver margin above, retroperitoneal lymph nodes, and retroperitoneal retroperitoneal nerve plexus close to the right margin of the superior mesenteric artery together. Resection of tumors in the tail of the pancreatic body is relatively easier than resection of the head of the pancreas, and the main consideration is whether the tumor has splenic artery and splenic vein invasion. If there is no splenic artery or splenic vein invasion, it is sufficient to perform caudal pancreatic resection with preservation of the spleen; if there is splenic artery or splenic vein invasion, it is necessary to remove the spleen together, which is called caudal pancreatic resection plus combined splenectomy, and to perform retroperitoneal lymph node dissection.