Peripheral intravenous catheterization (PICC) is the delivery of a catheter into the superior vena cava through a peripheral vein puncture for medium to long term intravenous fluid therapy. PICC placement, also known as peripheral intravenous catheterization, is performed by puncturing and inserting a catheter from a peripheral vein in the elbow, such as the median elbow, vein of the head, vein of the head, or femoral vein, or external jugular vein, and placing the tip of the catheter in the superior vena cava. Some chemotherapeutic drugs and nutritional fluids irritate the peripheral veins more seriously, which can easily lead to peripheral phlebitis and fluid extravasation, while these fluids are less irritating to the central vein. Therefore, PICC catheterization is mostly used for patients who need to be infused with fluids for more than 2 weeks, patients who are fed with chemotherapeutic drugs such as adriamycin, and patients who are given parenteral nutritional fluids, and so on. PICC catheterization also has complications such as phlebitis, puncture point infection, catheter breakage, catheter obstruction, etc. Patients who need to perform PICC catheterization should be fully aware of its advantages and disadvantages before choosing to perform it.