In　this　paper,　a　Dy3+:Ca2Al2SiO7　single　crystal　was　grown　successfully　by　the　Czochralski　technique.　The　effective　segregation　coefficient　of　Dy3+　ions　in　Dy3+:Ca(2)Al(2)SiO(7　&　nbsp;)crystal　was　measured　to　be　1.12.　The　crystal＇s　spectroscopic　properties　were　investigated　in　detail.　The　absorption　cross　sections　at　452　nm　are　1.03　x　10(-21)　cm(2),　and　0.98　x　10(-21)　cm(2)　with　the　full　width　at　half　maximum　10.79　and　4.89　nm　for　pi-and　sigma-polarizations,　respectively.　Based　on　the　Judd-Ofelt　theory,　the　radiative　transition　probabilities,　fluorescence　branching　ratios,　and　radiative　lifetime　of　Dy3+:Ca2Al2SiO7　crystal　were　obtained.　The　emission　cross　sections　at　574　nm　are　13.82　x　10(-21)　cm(2),　and　8.33　x　10(-21)　cm(2)　for　pi-　and　alpha-polarizations,　respectively.　The　fluorescence　decay　time　of　F-4(9/2)　multiplet　is　334.9　mu　s,　and　the　fluorescence　quantum　efficiency　is　58.6%.　These　results　show　that　Dy3+:Ca2Al2SiO7　crystal　is　a　promising　yellow　laser　material　suitable　for　commercial　450　nm　blue　laser　diode　pumping.&　nbsp;　&　nbsp;