The　site　occupation　engineering　of　activators　in　the　phosphor　directly　affects　its　luminescence　properties;　thus,　revealing　the　relationship　between　the　site　occupation　and　the　activator　luminescence　is　of　great　significance.　In　this　work,　a　high　efficiency　green　phosphor　Sr8CaLu(PO4)(7):　Eu2+　(SCLP:　Eu2+)　was　successfully　constructed　based　on　the　model　of　whitlockite　beta-Ca-3(PO4)(2)　host,　and　its　phase　structure,　morphology　features　and　optical　properties　were　systemically　investigated.　The　as-prepared　SCLP:　Eu2+　phosphor　had　a　monoclinic　symmetry　and　a　broad　green　emission　from　420　to　730　nm　with　a　quantum　yield　as　high　as　77%.　The　SCLP　host　offered　five　types　of　Sr2+　ions　sites　for　Eu2+　ions　occupation;　and　the　PL　spectra　were　divided　into　three　sub-peaks　locating　at　501　(19960.08　cm(-1)),　527　(18975.33　cm(-1))　and　566　nm　(17667.84　cm(-1)),　which　were　proved　to　the　emission　of　Eu2+　ions　at　the　nine-coordinated　Sr(1,　3,　5)O-9,　eight-coordinated　Sr(2)O-8　and　special　vacant　Sr(4)O-6　sites,　respectively.　The　thermal　stability　was　improved　through　the　package　of　SiO2,　and　the　activation　energy　was　enhanced　from　0.1098　to　0.1457　eV.　Eventually,　the　SCLP:　xEu(2+)　phosphors　were　applied　in　white　light-emitting　diode,　showing　high　color　rendering　index　(Ra　=　94.4　and　R9　=　81.7)　and　moderate　correlated　color　temperature　(CCT　=　4902　K).　This　work　could　help　to　understand　the　mechanism　behind　the　site-controlled　activator　emission　and　offer　some　meaningful　ideas　to　design　a　new　whitlockite　phosphor　with　desirable　spectral　emission　for　application　in　high　quality　lighting　source.