The　CaLa1-xAl3O7:xDy3+　(0&lex&le0.15)　phosphors　were　synthesized　by　high　temperature　solid-state　rmethod.　The　phase　was　characterized　by　X-ray　diffraction　(XRD).　The　effects　of　Dy3+doped　concentration　on　crystal　structure　and　luminescence　properties　of　CaLa1-xAl3O7:xDy3+　were　studied.　The　unit　cell　volume　decreases　as　Dy3+　doped　concentration　ion　increasing.　The　luminescence　of　CaLaAl3O7:Dy3+　under　348　nm　excitation　originated　from　Dy3+　characteristic　emission,　the　478　nm,　577　nm　and　a　small　peak　at　667　nm.　The　chromaticity　coordinates　of　luminescence　of　CaLa1-xAl3O7:xDy3+　have　almost　the　same　value,　which　are　close　to　CIE　isoenergetic　white　light　point　(x=0.33,　y=0.33).　The　effect　of　Dy3+　concentration　on　the　emission　intensity　of　CaLa1-xAl3O7:xDy3+　was　investigated.　The　result　shows　that　the　emission　intensity　of　CaLa1-xAl3O7:xDy3+　phosphor　firstly　increasesd　as　Dy3+concentration　increasing,　then　decreasesd,　viz,　the　concentration　quenching　exists.　The　Dy3+concentration　corresponding　to　the　maximal　emission　intensity　is　4　mol%.　The　concentration　quenching　mechanism　is　the　d-d　interaction　by　Dexter　theory.