A　multi-position　disordered　Er3+:Gd2SrAl2O7　single　crystal　was　grown　by　the　Czochralski　method.　Room　temperature　polarized　spectral　properties　of　the　crystal　were　investigated　in　detail.　The　Judd-Ofelt　theory　was　applied　to　analyze　the　polarized　absorption　spectra.　The　peak　stimulated　emission　cross-sections　of　the　I-4(13/2)-＞　I-4(15/2)　transition　reach　0.79　x10(-20)　and　1.25x10(-20)　cm(2)　for　sigma　and　pi　polarizations,　respectively.　The　gain　curves　are　flat　with　full　widths　at　half　the　maximum　larger　than　60　nm.　Fluorescence　lifetimes　of　the　I-4(13/2)　multiplet　for　Er3+　ions　were　fitted　to　be　4.93　ms　and　3.48　ms　from　measured　fluorescence　decay　curves　for　bulk　and　powder　samples,　respectively.　The　results　show　that　the　Er3+:Gd2SrAl2O7　crystal　may　be　a　potential　gain　medium　for　a　1.55　mu　m　laser　with　low　pumping　threshold.