本文以4～20K 温区为重点,评述了电热制冷的原理和实验结果。由于输入功来源于介电材料的电极化,所以这种制冷技术不需要运动部件。文章讨论了各种已经研究过的介电材料和它们所显示出的令人失望的电热效应值。实验得出的结果与理论模型是完全一致的。文章指出,实际上的电热制冷,用现有的材料还不行,仍需进一步研究介电材料。 In this paper, 4 ~ 20K temperature zone as the focus, reviewed the principle of electric cooling and experimental results. Since the input power is derived from the electrical polarization of the dielectric material, this cooling technique does not require moving parts. The article discusses various dielectric materials that have been studied and what they show as a disappointing electrothermal effect value. The experimental results are completely consistent with the theoretical model. The article pointed out that the actual electric cooling, with the existing materials is not enough, still need further study of dielectric materials.