The advantages and disadvantages of shunt and dissection of portal hypertension are as follows: 1. Shunt can directly reduce the pressure of portal vein, but after shunt, the blood flowing from portal vein to liver is reduced, so the amount of nutrients absorbed by gastrointestinal tract through liver decomposition and metabolism is also less, which affects the absorption of human nutrients; 2. After patients are treated by dissection, a large amount of blood still flows from portal vein to liver, and the nutrients absorbed by human body are still absorbed and metabolized through liver, so the probability of patients developing hepatic encephalopathy is lower, but the portal hypertension is not relieved.