PICC is the abbreviation for Peripheral venous puncture central venous placement, which is a catheter placed through the peripheral arm vein up to the near superior vena cava or the right atrium. It is mainly used for patients who need long-term chemotherapy and have poor peripheral vascular quality, which can reduce the occurrence of phlebitis and improve the quality of life of patients. The operator should operate in strict accordance with the principle of asepsis to keep the catheter and other equipment free from contamination. 3. The vascular quality and coagulation function of the patient should be normal before surgery to avoid life-threatening thrombosis. 4. Saline should be injected into the tube after smooth placement to ensure smooth pipeline, and the patient should be flushed with saline pulse every week after surgery.