A　novel　inorganic-organic　hybrid　material,　[Cu(En)(2)](2)H-2[{Cu(En)(2)}(2)(H2W12O42)]　center　dot　6.5H(2)O　(I)　based　on　polyoxotungstates　and　Cu2+　ions,　has　been　successfully　synthesized　under　hydrothermal　conditions　and　structurally　characterized　by　single-crystal　X-ray　diffraction,　IR　spectra,　and　TG　analysis.　Structural　analysis　indicates　that　the　structure　consists　of　a　one-dimensional　structure　constructed　from　the　polyoxoanion　[H2W12O42](10-)　bridged　by　{Cu(En)(2)}(2+)　groups.　Each　[H2W12O42](10-)　cluster　in　the　polymeric　chain　is　linked　to　two　neighbors　through　four　coordination　groups　of　mu(2)-[Cu(En)(2)](2+).　Furthermore,　it　extends　into　a　three-dimensional　supramolecular　network　by　hydrogen　bonding　interactions.