Needle placement is an invasive operation and requires strict attention to the aseptic procedure. When puncturing, attention should be paid to the presence of redness, swelling and skin breakage at the puncture site, observation of the direction of the vessels to select the appropriate vessel for the operation, and good regular disinfection to prevent infection. The indwelling needle needs to be fixed properly and the limb on that side should avoid excessive activities to avoid dislodging the indwelling needle. Pay attention to the local hygiene, usually washing should not be wet by water. Before each use of the indwelling needle, blood should be drawn back and then the tube should be flushed with saline, and the tube should be sealed with heparin after use to prevent the formation of blood clots in the tube. The site of the indwelling needle should be chosen for the upper extremity as much as possible, avoiding to keep it in the lower extremity to avoid blockage due to activity or gravity. Do not push in or pull out the indwelling needle by yourself, and avoid scratching the fixed site. Observe diligently for redness, swelling, pain, and secretion at the site of indwelling needle puncture.