When intravenous potassium chloride infusion should be done with great caution, there are several points that need to be noted, mainly the concentration of intravenous potassium chloride, drip rate, daily potassium supplementation and potassium supplementation in urine, which are summarized as four inappropriate: First, the concentration should not be too large, that is, the concentration of potassium chloride should not exceed 3g/L, that is, a maximum of 1.5g of potassium chloride in 500ml of liquid. -3g, the patient or family members should not adjust the infusion rate on their own. The total amount of potassium should not be too much, but should be supplemented according to the level of blood potassium, 4.5-6g per day. 4. Potassium should not be supplemented too early, that is, when the urine volume reaches more than 40ml per hour or when the 24-hour urine volume reaches more than 500ml. During the process of intravenous potassium supplementation, we should observe the patient’s reaction and monitor the blood potassium level, and deal with any situation in time.