The role and function of potassium infusion is to alleviate hypokalemia caused by insufficient potassium intake, excessive loss, and excessive excretion. When the body has insufficient potassium intake due to digestive tract obstruction, prolonged fasting, coma, etc.; loses a large amount of potassium due to severe vomiting, diarrhea, etc.; loses too much potassium due to prolonged application of diuretics such as furosemide and excessive potassium discharge from the kidneys due to renal tubular acidosis, etc., all of them can cause hypokalemia of the body, which can lead to the emergence of symptoms such as muscular weakness, anorexia, nausea, sinus tachycardia and so on. When mild hypokalemia occurs, it can be corrected by eating potassium-rich foods such as oranges and bananas; inability to eat or in acute stage, it needs to be corrected by potassium infusion, usually potassium chloride. The infusion should be titrated slowly at a rate of 20 mmol/L, and too fast may be life-threatening; potassium supplementation is not suitable for people with mild potassium deficiency and kidney disease. Potassium infusion usually needs to be done under the supervision of a doctor and the blood potassium concentration should be closely monitored.