Abstract: The differential pulse stripping voltammetry is used to detect the lead and cadmium heavy metal ions in liquid phase. The experimental parameters can be gradually optimized by changing the experimental conditions. The experimental results are analyzed and discussed. The detection limits for lead and cadmium ions are 0.54 g/L, 0.79 g/L, respectively, and the linear correlation coefficient of cadmium reaches to 0.999 7. The voltammetry used here has merits such as high sensitivity, easy operation, simple structure, low pollution, repeatable measurement, and show potential application for real-time monitoring of heavy metal ions.