Common infusion faults: I. Faults caused by puncture, such as the needle slipping out of the blood vessel, or the needle bevel pressing against the vessel wall, resulting in redness, swelling, heat and pain in the blood vessels of local tissues, at which time re-puncture is required. Second, the infusion failure caused by the needle, there can be needle blockage or foreign body blocking the needle, then the needle should be replaced again for another infusion. Third, the infusion can not be caused by low pressure, at this time, raise the position of the infusion bottle can continue to infuse. Fourth, the liquid level in the drip tube is too high, the solution bottle can be tilted so that the needle inside the bottle can be exposed to the liquid level to continue the infusion. V. When there is air leakage or crack in the dropper, the dropper must be replaced in time.