As　is　well　known,　whitlockite　/3-Ca3(PO4)2-type　phosphors　are　easily　evolved　to　a　new　crystal　structure　by　cation　substitution,　and　have　various　crystallographic　sites　for　doping　activators　to　achieve　luminescence.　Herein,　a　novel　broadband　emitting　Sr8MgIn(PO4)7:　Eu2+　(SMIP)　phosphor　was　prepared　by　high　temperature　solid　state　reaction.　Its　crystal　structure　was　analyzed　and　refined　via　the　Rietveld　refinement　method.　The　SMIP　crystal　presents　a　monoclinic　system　with　space　group　C2/m.　Their　diffuse　reflection　and　excitation　spectra　both　show　an　intense　absorption　to　the　wavelength　of　250-500　nm.　And　the　photoluminescence　spectrum　exhibits　a　strong　broadband　emitting　from　450　to　800　nm.　Moreover,　the　luminescence　decay　curves　reveal　three　kinds　of　Sr/　Mg2+　crystallographic　sites　for　Eu2+　occupying　in　SMIP　host.　For　SMIP:　xEu2+　samples,　the　optimized　doping　concentration　was　determined　to　be　0.03,　and　the　energy　transfer　among　the　nearest-neighbor　was　dominating.　Further,　the　activation　energy　was　estimated　to　be　0.1145　eV.　Finally,　white　light-emitting　diodes　(WLED)　lamps　were　fabricated　by　coating　the　mixtures　of　SMIP:　0.03Eu2+　phosphors　and　BaMgAl10O17:　Eu2+　phosphors　on　the　surface　of　400　nm　near-ultraviolet　chip.　The　optimized　WLED　lamp　exhibits　a　correlated　color　temperature　of　3034　K　and　a　good　color　rendering　index　of　91.7.　These　results　demonstrate　the　commercialized　prospect　of　SMIP:　Eu2+　materials　as　a　broadband　orange　phosphor　for　application　of　solid　state　lighting.