The　three-dimensional　vanadium-nickel　phosphate　(C2H10N2)4[H2Ni(H2O)2(VO)8(OH)4(PO4)8]center　dot　H2O　(1)　was　prepared　by　hydrothermal　methods　and　its　structure　and　electrochemical　properties　were　characterized.　The　compound　crystallizes　in　the　monoclinic　system　with　the　space　group　P21/n　and　cell　parameters　a　=　14.392(3)　angstrom,　b　=　10.122(2)　angstrom,　c　=　18.305(4)　angstrom,　=　90.34(3)degrees,　V　=　2666.7(9)　angstrom　3,　Z　=　2.　The　structure　consists　of　macroanionic　VNiP　layers　constructed　from　VO5　square　pyramids,　NiO6　octahedra,　and　PO43　tetrahedral　groups.　The　layers　are　further　connected　into　a　3D　infinite　structure　through　the　NiO6　octahedra　and　there　are　organic　species　protonated　ethanediamine　molecules　and　water　molecules　located,　which　make　the　structure　more　stable.　Its　electron　sponge　behavior　was　revealed　via　electrochemical　tests.