A　novel　Praseodymium-doped　borate　(Pr:alpha-BBO)　laser　crystal　was　grown　successfully　by　using　the　Czochralski　method.　The　phase　structure,　absorption　and　fluorescence　lifetime,　as　well　as　blue　laser　diode　(LD)　pump　performances　of　Pr:alpha-BBO　were　totally　studied.　The　segregation　coefficient　and　valence　state　of　Pr　ions　in　the　crystals　were　investigated　using　inductively　coupled　plasma　atomic　emission　spectroscopy　and　X-ray　photo-electron　spectroscopy.　A　450　nm　blue　LD　was　employed　to　carry　out　a　pump　experiment　on　the　Pr:alpha-BBO　slab　crystal　with　a　doping　concentration　of　0.22　at.%.　The　main　emission　peaks　of　Pr3+　ions　in　the　orange-red　light　band　were　found　to　be　at　611.5　nm,　634.7　nm,　and　638.3　nm.　The　experimental　results　show　that　the　Pr:alpha-BBO　crystal　exhibits　higher　orange　light　fluorescence　emission　performance,　with　an　emission　peak　intensity　at　611　nm　that　is　2.1　times　stronger　than　that　at　635　nm　due　to　the　splitting　of　the　3P0　-＞　3F2　transition　(635　nm).　By　optimizing　the　Pr:alpha-BBO　laser　crystal　growth　process　and　further　solid-state　laser　experiments,　it　can　be　expected　to　have　broad　applications　in　laser　medicine,　spectral　detection,　and　nonlinear　optical　frequency　conversion　fields.