A　novel　Cu-Zn-TiO2　nanotube　array　(TNTA)　polymetallic　nanoelectrode,　intended　to　improve　the　electrochemical　nitrate　removal　efficiency,　was　fabricated.　The　nanoelectrode　was　fabricated　by　plating　Cu　onto　a　Ti　nanoelectrode　and　then　plating　Zn　onto　the　Cu/Ti　bilayer　electrode　produced.　The　Ti　nanostructures　on　the　Cu-Zn-TNTA　nanoelectrode　surface　gave　the　nanoelectrode　a　large　specific　surface　area,　and　the　Zn　and　Cu　gave　the　nanoelectrode　a　high　electrocatalytic　activity　for　reducing　nitrate.　Scanning　electron　microscopy　images　showed　that　the　Cu-Zn-TNTA　polymetallic　nanoelectrode　had　a　honeycomb　structure　with　spongy　deposits.　X-ray　diffractometry　results　showed　that　the　Cu-Zn-TNTA　nanoelectrode　predominantly　contained　Cu,　O,　Ti,　and　Zn.　The　nitrate　removal　efficiency　of　the　Cu-Zn-TNTA　nanoelectrode　was　345.7%　of　the　removal　efficiency　for　a　Ti　nanoelectrode.　The　presence　of　NaCl　allowed　both　the　cathodic　reduction　of　nitrate　and　the　anodic　oxidation　of　the　ammonia　and　nitrite　byproducts　to　be　achieved　with　high　removal　efficiencies,　especially　using　an　IrO2　anode.　In　the　present　of　NaCl,　nitrate　removal　rate　was　93.4%　in　current　density　of　30　mA/cm(2)　after　90　min.　Nitrate　was　completely　removed　using　the　IrO2　anode,　and　little　ammonia　was　detected　in　the　treated　solution.　The　reduction　efficiency　increased　slightly　as　the　initial　nitrate　concentration　increased　through　the　range　20-100　mg/L,　and　the　pH　had　little　effect　on　the　nitrate　reduction　efficiency.　(C)　The　Author(s)　2016.　Published　by　ECS.　All　rights　reserved.