After the occurrence of hypokalemia, there are generally two methods of potassium supplementation clinically. The first is oral potassium supplementation, which is relatively safe, and one can also eat fruits or vegetables rich in potassium. The second method is intravenous potassium supplementation. The first thing to note with intravenous supplementation is the patient's urination status. If the patient’s urination is normal, potassium chloride can be administered intravenously but must be diluted. In clinical practice, the concentration of intravenous potassium chloride generally does not exceed 0.3%, so we must pay attention to the concentration during potassium supplementation.