There are significant differences in the effects of lancets and indwelling needles, and patients need to use them appropriately and in accordance with medical advice. 1. Retention needle: mainly refers to the long-term infusion time once pierced into the shaving, reusable needles. Clinically, it is mostly used for patients who will have swelling, and it can also reduce the pain of multiple injections. 2. Retention needle: mainly the catheter and the needle core together with the puncture into the blood vessel, and in the catheter all into the blood vessel, the needle core back to withdraw, only the soft catheter left in the blood vessel, so as to carry on the infusion treatment, the clinical main can be divided into open and closed type. Clinical can be used for intermittent, continuous or daily intravenous infusion therapy, not only easy to puncture, can reduce the child’s fear and pain due to repeated puncture, but also can reduce the parents’ anxiety. The needle can also improve the efficiency of nurses and the quality of nursing care, and can avoid the reaction during the drug and reduce the cost of treatment. It is recommended that patients choose to use indwelling needles and indwelling needles under the guidance of doctors, and pay attention to its related matters and reasonable treatment.