The indwelling needle has the advantage of protecting the vein, etc. The next day after the indwelling needle is completed, the drug can be infused directly through the interface on the indwelling needle. Intravenous needle consists of needle core, cannula, needle holder, etc. When puncturing, the needle core and the hose are sent into the blood vessel together, and finally the needle core is withdrawn and the hose is left in the blood vessel, which is a commonly used tool for peripheral intravenous infusion in clinical practice, and after completion of the indwelling, the next day, the fluids can be infused directly through the interface on the indwelling needle, avoiding repeated puncture. Intravenous needle is mainly used for short-term intravenous infusion treatment, with the advantages of protecting the vein, reducing the pain of repeated puncture, and facilitating timely treatment. If the needle is placed, care should be taken to avoid contamination and damage to the puncture site, and if local pain, swelling and discomfort occurs, the physician should be informed and replaced in a timely manner.