Abstract: In this paper, the following facts are described, during the electro-depositing of Pd(Ⅱ) with Hg(Ⅱ) on the glassy carbon electrode, an electro-active compound between metals, Hg₂-Pd, was formed. When it was stripped, Pd showed a stripping process involved two electrons and two chrolide ions with irreversibility. The electrode with Hg₂Pd was scanned in forward positive potential in a base-solution containing HClO₄-HCl-SnClsub>2. The stripping catalytic pcak current obtained was related to the concentration of Sn(Ⅱ) and Cl-.