A　novel　nanometer　iron　oxide　support　was　successfully　synthesized　by　the　sol-gel　method.　The　results　of　X-ray　diffraction,　differential　thermal　analysis,　thermogravimetric　analysis,　scanning　electron　microscopy,　and　N-2　physical　adsorption　show　that　the　prepared　Fe2O3　particles　have　a　typical　mesoporous　structure　with　pore　diameters　of　18.8-25.0　nm.　The　effect　of　the　crystal　phase　composition　of　Fe2O3　on　catalytic　activity　of　the　Ru-K/gamma-Fe2O3　catalyst　was　further　investigated　under　the　conditions　of　475　degrees　C,　10　MPa,　10000　h(-1),　and　V(H-2)/　V(N-2)　=　3.　The　higher　the　content　of　gamma-Fe2O3　in　the　support,　the　better　the　catalytic　activity　of　the　catalyst.