The indwelling needle is a more commonly used route of intravenous infusion in clinical practice, which reduces the pain caused by repeated venous puncture to the patient by temporarily leaving a needle in the skin. Before the infusion operation of the needle, first of all, we should check the patient’s name, bed number and other basic information, and then check whether the needle sterile cover protective film is intact, and whether there is any broken skin around it, etc. After confirming that the patient is not uncomfortable, the needle should be used for infusion. After confirming that the patient has no discomfort, the intravenous cap of the indwelling needle is locally sterilized, then the intravenous infusion tube is drained of air, and finally the infusion needle is inserted into the intravenous cap of the indwelling needle. The second day of the indwelling needle to connect the infusion set of operating procedures as described above, in the infusion should be closely observed when the indwelling needle has no blockage, if there is a blockage of the infusion tube to seek medical personnel in time to flush the operation. The operation of connecting the infusion set needs to be operated by professional doctors or nurses, and the patients and their families should not operate blindly by themselves to avoid injury.