13 Boys with fever found to be hypokalemia potassium supplementation can not be replenished may be insufficient amount of potassium supplementation, short duration of potassium supplementation, there is a loss of potassium, or the body is severely deficient in potassium. Fever, if accompanied by vomiting and diarrhea, sweating, urinating, and can not eat normally when, resulting in potassium can not be replenished and constantly lost, may be accompanied by hypokalemia. It is equally important to correct the primary cause of the illness and to prevent further loss of potassium while supplementing potassium. In addition to regular potassium supplementation as prescribed by the doctor, potassium-rich foods such as bananas, oranges and tangerines can be consumed as appropriate. As oral potassium supplementation drugs have certain stimulation to the stomach, it is not advisable to take too much of them; intravenous potassium supplementation will cause strong pain when it is too fast, therefore, clinical potassium supplementation is a slower process, and it takes a certain period of time to see the effect. Therefore, clinical potassium supplementation is a slow process, and it takes time to see the effect. And the time of potassium supplementation is affected by the condition, generally the worse the physical quality, the higher the degree of potassium deficiency, the longer the time of potassium supplementation. In addition, diseases such as aldosteronism, Cushing’s syndrome, renal tubular acidosis, metabolic alkalosis and so on, can also lead to a decrease in blood potassium, and it is possible that normal potassium supplementation will not be able to maintain the concentration of potassium in the blood. If there is any suspicion of such diseases, further examination is required, and active treatment of the primary disease is required to relieve the causative factors of potassium deficiency, which can be gradually recovered. Parents should be patient and take care of their children scientifically when accompanying them for treatment, and provide timely feedback to the doctor if their children show any signs of discomfort.