Er3+:GdVO4　single　crystal　with　large　size　and　good　optical　quality　has　been　grown　by　Czochralski　method.　Its　absorption　and　emission　spectra　were　measured　at　room　temperature.　The　absorption　cross-sections　are　calculated　on　the　basis　of　its　spectra.　According　to　Judd-Ofelt　theory,　the　phenomenological　intensity　parameters　Omega(lambda)　of　Er3+　ions　have　been　fitted　adopting　least-squares　method.　Moreover,　the　spectral　parameters　of　Er3+　ions　including　oscillator　strengths,　radiative　transition　probabilities,　radiative　lifetimes　and　integrated　emission　cross-sections　have　been　calculated.　From　the　parameters　mentioned　above,　the　laser　emission　probability　of　Er3+:GdVO4　crystal　was　discussed.　(C)　2003　Elsevier　B.V.　All　rights　reserved.