AS a new type of energy storage element,supercapacitor is more and more widely used,. However, they are still in the cultivation stage in many market segments, and relevant industry standards are not perfect. In this paper, the characteristic parameters of electrical performance are derived by using the equivalent circuit model of supercapacitors,the differences of the testing methods of the characteristic parameters of electrical energy in the main standards is analyzed, and the key points of the application of supercapacitor in the smart meter are put forward. It has some reference value for the comprehensive understanding of the electrical properties of supercapacitors and the correct application of supercapacitors in practical work.