Regular infusion is not much harm to blood vessels, as long as it is not too long. For long time infusion or including infusion of chemotherapy drugs and vasoactive drugs, such drugs have certain damage to blood vessels, especially the infusion contains some irritating potassium ions, which may be a harm to blood vessels, causing phlebitis or severe pain caused by intravenous infusion. Therefore, if infusion or chemotherapy drugs are frequently used, deep vein infusion, subclavian venipuncture or local indwelling needle can be taken, which may be a kind of protection for the infusion vessels on the body surface. For the emergence of phlebitis or redness and swelling of the veins, local hot compresses or external magnesium sulfate can be taken to play the role of anti-inflammatory and swelling, or each time the intravenous infusion, different vessels can be alternately taken for infusion, which may reduce the damage to the blood vessels.