If intravenous potassium supplementation is desired, the following principles should be noted: the first principle is to supplement potassium with urine, because potassium is metabolized and excreted by the kidneys. If there is a problem with kidney function, resulting in oliguria or anuria, potassium supplementation should be done carefully, otherwise it will lead to hyperkalemia, which is difficult to correct and may induce the risk of malignant arrhythmia. The second principle is to control the concentration of potassium supplementation. Generally, the concentration of liquid is required to be less than three parts per thousand to avoid the high concentration of potassium chloride that can stimulate the peripheral venous vessels, which can lead to symptoms of vasculitis, and when infusing solutions containing potassium, attention should be paid to limiting the speed of the liquid, because the liquid containing potassium chloride can easily stimulate the blood vessels and cause painful symptoms during infusion.