The sudden change of pancreatic drainage from 30 ml to 5 ml may be caused by pre-drainage incompatibility, bile secretion after postoperative feeding, intestinal fistula or hypoproteinemia. 1. Sudden change of drainage fluid from 30 ml to 5 ml due to poor drainage in the preoperative period, such as folding, twisting or blockage of the drainage tube. 2. Bile secretion after eating after surgery, after starting to eat a liquid diet, bile and pancreatic fluid secretion increases and the phenomenon of increased drainage fluid caused by bile and pancreatic fluid, gastric fluid, intestinal fluid secretion will have different degrees of increase, so the increase in the drainage fluid, as long as there is no discomfort, it is a normal phenomenon, there is no need to deal with. 3. If the drainage fluid suddenly changes from 30 ml to 5 ml due to intestinal fistula or hypoproteinemia, the patient may have abdominal pain, abdominal distension, fever, abdominal distension and other symptoms or signs. If it is found that the pancreatic drainage fluid suddenly changes from 30ml to 5ml, it is recommended that the patient should consult the doctor in time, and after the doctor clarifies the cause of the disease, the patient should be given targeted treatment.