Er3+　:　Y-0.5　Gd-0.5　VO4　crystal　with　good　optical　quality　was　grown　by　Czochraski　method.　The　structure　of　the　crystal　was　determined　by　X-ray　powder　diffraction　method.　The　segregation　coefficient　of　Er3+　ions　in　the　crystal　was　measured　by　the　ICP　method.　The　absorption　and　emission　spectra　were　also　measured.　On　the　basis　of　the　spectra,　the　absorption　cross-sections,　emission　spectrum　FWHM　and　fluorescence　lifetime　of　the　crystal　were　calculated.　From　the　properties　mentioned　above.