Abstract: The Ru₁₅Ir₁₅Sn_xTi_70-x/Ti anode is prepared by sol-gel process.Accelerated stability test(AST),SEM, EPMA XRD and electrochemical test such as polarization curve, current efficiency and cyclic voltametric detection show that the composition elements of the anode is well distributed,the potential of chlorine evolution as well as oxygen evolution are all increased,and the potential difference between chlorine evolution and oxygen evolution as well as the current efficiency keep high level after the addition of Sn.When the Sn content(by mol)is 20%,60% and 70%,the life time of the anodes is increased significantly,and the anodes with 20% Sn keeps high current efficiency in diluted sea water indicating the anode is suitable for use in diluted seawater.