Rare　earth　ions　doping　multiple　activation　lattice　sites　is　an　important　strategy　to　control　luminescent　properties　of　luminescent　materials.　In　the　work,　Eu2+　doped　Ca9La(PO4)7　phosphor　was　fabricated　to　study　with　the　dependence　of　lattice　structure,　site　occupation　on　the　luminescence　properties.　Rietveld　refinement　results　of　XRD　shows　that　the　phosphors　are　pure　phases　with　the　same　crystal　structure　of　whitlockite　8-Ca3(PO4)2.　Further,　Eu2+　ions　at　four　lattice　sites　are　distinguished　by　comparing　the　change　of　bond　energy,　preferentially　occupies　the　smaller　energy　variation　sites　of　Eu(3)[CN　=　8],　Eu(4)[CN　=　6](Eu　luminescent　center　at　La　site),　Eu　(1)[CN　=　7],　Eu(2)[CN　=　8].　The　activation　energy　of　the　emission　band　at　418　nm　is　calculated　at　about　0.2872eV,　and　the　activation　energy　of　the　emission　band　at　512　nm　about　0.2022eV.