The　photoluminescence　(PL)　property　effect　of　Sc3+　on　the　Er3+/Y3+/Yb3+　doped　Al2O3　powders　prepared　by　sol-gel　method　has　been　investigated.　The　X-ray　diffraction　(XRD)　and　transmission　electron　microscopy　(TEM)　implied　that　the　distribution　of　dopants　(Er3+,　y(3+),　Yb3+,　Sc3+)　was　improved　effectively　with　the　rise　of　Sc3+　concentration.　The　Fourier　transform　infrared　spectra　(FTIR)　results　demonstrated　that　the　ligand　around　the　quenching　center-OH　and　the　population　of　-OH　were　altered　by　introducing　different　amounts　of　Sc3+.　The　PL　intensity　centered　at　1530　nm　was　increasingly　improved　with　the　rise　of　Sc3+　concentration,　as　well　as　the　corresponding　full　widths　at　the　half　maximum　(FWHM)　and　lifetime.　The　optimized　PL　intensity　was　4.7　times　higher　than　that　non-Sc3+　doped　sample　for　the　Al2O3　powders　codoped　with　10mol%　Sc3+.　This　material　can　be　promising　candidates　for　optical　fiber　amplifier.