Potassium chloride solution has the following functions: 1, correcting electrolyte disorders, the body fluid has a certain electrolyte balance, electrolytes include potassium ion, sodium ion, magnesium ion, chloride ion, etc., potassium ion is one of the very important ones, the normal value of potassium ion is 3.5-5.5 mmol/L, lower than normal will be harmful to the body, so potassium chloride solution can correct electrolyte disorders; 2, it can treat or prevent Cardiac arrhythmia, hypokalemia can lead to cardiac arrhythmia such as premature beats, and in serious cases, life-threatening malignant arrhythmia may occur, and potassium chloride solution can prevent and treat cardiac arrhythmia; 3, it can treat periodic paralysis, hypokalemia may cause periodic paralysis, and potassium supplementation treatment can treat this disease.