Potassium chloride has no effect on the fetus, but nutritional imbalance, partial diet or severe vomiting during pregnancy can lead to water-electrolyte disorders and hypokalemia. Hypokalemia has many adverse effects on the fetus and the pregnant woman, including fatigue, weakness, cardiac arrhythmia, and even cardiac arrest, which may adversely affect the development of the fetus. Hypokalemia in pregnancy requires timely supplementation of potassium chloride. 10% potassium chloride is prepared as polarized solution for infusion and energy supplementation, and attention is paid to supplementation of B vitamins. It is safer to supplement potassium with urine volume >500mL or more, and attention is paid to not overdoing the concentration of potassium supplementation.