This is because the normal range of human blood potassium is 3.5-5.5 mmol/L. If hypokalemia occurs, but with severe renal insufficiency and inability to urinate, it is very easy to control the dose of potassium during the process of potassium supplementation, which can lead to hyperkalemia. The danger of hyperkalemia is that it can cause cardiac arrest. If the kidneys are functioning normally and there is normal urination, the excess potassium will be excreted through the urine and can be maintained within the normal range of blood potassium. When the blood potassium falls below 3.5 mmol/L, potassium supplementation therapy should be initiated. The potassium supplementation regimen is mainly based on oral potassium supplementation, including the administration of potassium water or potassium chloride extended-release tablets, and the blood potassium changes and clinical symptoms should be closely monitored during the application process.