Abstract: The electrochemical characterization of B-doped diamond thin film electrode was studied by using cyclic voltammetry and amperometry to determine the response current of K₃Fe(CN)₆ in KCl and HCl-KCl solution, and by using the anodic scan to examine lead containing solution after concentrating it in KCl and KCl-HNO₃. According to the voltammetric measurements for K₃Fe(CN)₆ and lead, the electrodes showed rapid response, high sensitivity, good precision, and provided good resolving power for the determination of lead and cadmium, and gave satisfactory results in the analysis of a water sample. Compared with those results given by glassy carbon electrodes, the B-doped diamond film electrodes offered extreme stability over a period of one month. The effect of pH on the response current of electrodes was studied too. The results described here indicate that this low-resistivity material has suitable electrochemical property, and will be very useful in electroanalysis as a new electrode material.