The role of the foot to tie the indwelling needle is: to avoid frequent needling, reduce the patient’s pain, improve the efficiency of the nurse’s work and so on. 1. Avoid frequent needle sticks: the indwelling needle is a tool used for intravenous infusion, mainly leaving a tube in the vascular area for intravenous infusion. For patients who need long-term intravenous infusion, choosing to stick the indwelling needle on the foot is conducive to reducing the number of times of sticking the needle. 2. Reduce the patient’s pain: Especially for patients with thin blood vessels, it may be necessary to tie several times for each intravenous infusion to achieve the purpose of normal infusion, while the use of indwelling needles, there is no need to repeat the needling for each infusion, which reduces the number of times of vascular puncture and thus reduces the patient’s pain. It also protects the patient’s blood vessels and prevents repeated damage to the patient’s skin caused by frequent needle sticks. 3. Improve the work efficiency of nurses: feet on the indwelling needle can make the infusion of medication time is both flexible and convenient, can be at any time for infusion or to stop the infusion, so that the nurse’s work efficiency can be improved, but also to allow patients to timely infusion treatment. Especially for the rescue of critically ill patients is more convenient. For patients with thin blood vessels, intravenous infusion is more difficult, you can choose to tie the needle on the foot, not only to reduce their own pain, but also to facilitate timely and rapid infusion.