Intravenous catheterization is a common method for rehydration of patients with advanced tumor, and the common precautions are as follows: a. In the process of catheterization, attention must be paid to thorough disinfection to avoid bacterial operation, which may induce serious complications such as catheterized bacterial infection after catheterization; b. In the process of catheterization, the specific site of the punctured vessel must be clearly defined to avoid unsuccessful puncture and insertion of the catheter into the artery. Third, after the placement of the catheter, the blood must be pumped back to confirm the smoothness of the catheter to avoid twisting and folding of the front end of the catheter to avoid normal infusion; Fourth, patients with indwelling intravenous catheters need to be given daily dressing changes, and at the same time, after the infusion is completed, the catheter should be sealed and flushed to avoid the formation of local thrombosis.