Trypsin is a kind of digestive enzyme, which is mainly secreted by the pancreas. The human pancreas can secrete trypsinogen, which is the premise of pancreatic protease. After contacting with protein and fatty food or gastric acid in the gastrointestinal tract, trypsinogen will be rapidly activated to form pancreatic protease, which has the function of digestion and decomposition of protein and fat, and can produce amino acids and fatty milk that can be absorbed by human body. Therefore, pancreatic protease has an important digestive function. When the bile duct or pancreatic duct is blocked, trypsinogen will be activated to damage the pancreas itself, forming acute pancreatitis.