A　certain　amount　of　(3-aminopropyl)triethoxysilane　(APTES)　and　various　capacity　of　1,8-naphthalic　anhydride　(NA)　were　employed　to　modify　and　then　graft　onto　the　surface　of　the　dense　nano-silica　spheres　(DNSS)　via　a　post-grafting　method,　and　thereby,　a　novel　luminescent　density　nano-silica　hybrid　materials　have　been　successfully　synthesized.　Meanwhile,　the　structures　and　properties　of　obtained　hybrid　DNSS　were　characterized　by　XRD,　TEM,　N-2　sorption,　FT-IR,　and　TG　analysis.　Furthermore,　the　thermal　stability　of　before　and　after　modification　were　demonstrated　by　using　both　Kissinger　methods　and　Ozawa-Flynn-Wall　methods.　Particularly,　the　thermal　decomposition　behaviors　of　amino-modified　groups　and　NA-grafted　organic　molecules　were　emphasized　based　on　the　TG　and　DTG　analysis　and　then　the　related　mechanism　was　put　forward　according　to　Coats　and　Redfern　methods.　Finally,　as　a　comparison,　the　obtained　results　and　the　proposed　decomposition　mechanism　of　hybrid　DNSS　with　non-pores　were　discussed　with　that　of　mesopores　silicas　in　details.　(C)　2013　Elsevier　B.V.　All　rights　reserved.