In　recent　years,　doped　KLTN　(K1-xLixTa　1-yNbyO3)　crystal　in　paraelectric　state　was　reported　to　be　a　new　type　of　holographic　storage　medium　owning　to　its　great　promotion　for　diffraction　efficiency,　through　quadratic　electro-optical　effect　generated　by　external　electrical　field.　In　this　paper,　we　describe　the　preparation　method　of　the　KLTN　crystal　in　our　laboratory　and　report　our　preliminary　experimental　research　on　electrically　controllable　holography　in　a　KLTN:　Cu　crystal.　It　was　found　that　the　writing　intensity　and　polarization　of　the　readout　beam　affect　the　diffraction　efficiency　remarkably,　and　the　voltage　selectivity　of　holograms　stored　in　the　crystal　was　observed,　which　is　potential　to　increase　the　storage　capacity.