Patients using intravenous indwelling needle must do the following six precautions: 1, the puncture site as far as possible with the doctor to achieve asepsis, should wash their hands and face before the injection, pay attention to the puncture site, ensure that the skin is dry and skin clean, do not get wet local; 2, do not scratch the infusion patch or pull out the needle by themselves; 3, do not arbitrarily adjust the infusion rate of intravenous infusion; 4, pay attention to the protection of the puncture site, avoid limb If the puncture site feels red, swollen, hot or painful, inform the doctor and nurse in time; 6.