The indwelling needle can reduce the pain of repeated venous puncture, as well as reduce the damage to the venous blood vessels, applicable to children and critically ill patients as well as even intravenous infusion patients, the indwelling needle can be retained for a period of 3-5 days, the 2nd day of infusion first disinfected venous cap of the rubber plug, to avoid infection, the intravenous infusion needle can be inserted into the venous cap of the infusion indwelling needle. During the infusion, it is necessary to pay attention to the rate of progress of the infusion, when the infusion is about to end, it is necessary to timely notify the health care personnel, to avoid the control of access after the completion of the infusion leads to air embolism, after the end of the infusion. And then the indwelling needle for routine air tube, indwelling needle infusion after the end, it is recommended to massage the limbs, can promote venous blood circulation, in order to avoid the emergence of swollen and cold limbs, for infants and young children, the patient can use a clean towel, wrapped around the indwelling needle, so as not to baby in the play, inserted into the head of the indwelling needle lead to pain dislodgement, if the redness and swelling at the site of the placement of the indwelling needle, be sure to inform the doctor.