Potassium supplementation needs to pay attention to four inadvisable, not too strong, not easy too fast, not easy too much, not easy too early, see urine potassium. This statement is true. Intravenous potassium supplementation should be of moderate concentration and the drip rate should not be too fast. Potassium is best diluted in glucose solution or sodium chloride solution, the concentration should be 0.3%, the concentration should not be too high, too high there is a danger of causing cardiac arrest, intravenous potassium supplementation should not be pushed intravenously, but slowly drip, if a large amount of potassium supplementation in a short period of time will lead to cardiac arrest. Potassium supplementation should be based on the degree of potassium deficiency of the patient to accurately grasp the dosage, the initial potassium supplementation should try to reach the effective dose, to prevent the deterioration of the condition. Do not overdose on potassium intravenously, as high potassium is more dangerous than low potassium. When replenishing potassium, choose a larger blood vessel and do not puncture the same vein repeatedly to avoid phlebitis.