Portal vein thrombosis is often found in the perioperative period of portal hypertension, and a considerable number of physicians and patients are concerned about it. We will discuss our experience with the case. For reference only. Pre-operative portal vein thrombosis: In recent years, many PH patients have been transferred from overseas due to portal vein thrombosis before surgery, and the hospitals where the patients were treated were local tertiary hospitals with high hardware and software conditions. They think that “portal vein thrombosis is a contraindication to all kinds of therapies”, and they are worried that postoperative total portal vein thrombosis will be fatal if they do a flow dissection, or they are worried that the thrombosis will extend to the anastomosis if they do a shunt, or they are worried that the thrombosis will spread to the new liver if they do a liver transplant, or they are even a contraindication to all kinds of interventions. After examining the patients, we found that most of these patients had portal vein thrombosis but did not have large amounts of ascites, which means that there were still outflow tracts in the portal vein, which means that compensatory shunts had been formed, and the existence of these pathological shunts had been confirmed by the 3D reconstruction images. Since these pathological shunts can play a compensatory role, it is very important to protect these shunting pathways, and we must be sure enough to operate on them, otherwise the consequences are not conceivable. All patients underwent selective flow dissection in the emergency or elective setting, and all recovered successfully after surgery. Of course, intraoperative preservation of the portal communication branch and blockage of the penetrating branch require extensive experience and skill, as well as the necessary hardware. Incomplete intraoperative dissection of the penetrating branch will lead to early postoperative hemorrhage, as the residual individual penetrating branch will bear the blood flow and blood pressure of multiple preoperative penetrating branches. By the end of July 2015, more than 100 such procedures had been performed in our department with satisfactory outcomes. Postoperative portal vein thrombosis: with the development of medical technology, almost all splenectomy patients can now be found to have portal vein thrombosis on ultrasonography after surgery, which is related to the ligation of the splenic vein at the splenic hilum and the postoperative increase in platelets. If intraoperative portal channelled branches are found to be open and protected, these branches will compensate for shunting the portal blood flow after surgery without serious complications, but if these branches are intentionally However, if these traffic branches are intentionally or unintentionally severed during surgery, they may become the basis for postoperative total portal vein thrombosis. We routinely preserve the portal vein during elective dissection, so our patients do not experience clinical complications of portal vein thrombosis.