Based on classical Stöber reaction, Silica particles were synthesized. These particles were non-crystalline solid granules with smooth surfaces and good monodispersity. The average size was 900±50 nm. Rare earth ions combined with the free phosphate ions hydrolyzed by tripolyphosphate (TPP) on surface of silica, the SiO2-LnPO4 (Ln=La: Ce, Tb) core-shell particles were thus obtained by homogeneous precipitation method and their size were 1.5±0.1 μm. The core-shell product had obvious fluorescence property and the maximum fluorescent emission peak was at 547 nm. With no rare earth element in the core and with uniform morphology and size, this SiO2-LnPO4 material could decrease the synthetic cost and improve the application property of the LnPO4 green phosphor. This material might have important application prospect in the illumination field.