The　precursors　organic　cerium　deposits　were　obtained　by　a　stripping　precipitation　method　from　cerium-loaded　P507　organic　phase　using　oxalic　acid　as　a　precipitating　agent　and　nano-sized　ceria　particles　were　prepared　by　calcining　the　precursors　at　500　degrees　C.　The　morphologies,　phase　structure　of　the　precursors　and　ceria　particles　were　characterized　by　scanning　electron　microscopy　(SEM),　transmission　electron　microscopy　(TEM),　X-ray　diffraction　(XRD),　thermogravimetric　analysis　(TG-DSC)　and　infrared　spectroscopy　analysis　(FTIR).　The　results　indicated　that　the　concentration　of　oxalic　acid　had　a　little　impact　on　the　morphology　of　the　precursors,　which　was　blocky-shape　Ce-2(C2O4)(3)center　dot　10H(2)O　with　a　monoclinic　lattice　structure.　With　the　volume　ratio　of　organic　phase　and　oxalic　acid　aqueous　solution　(aqueous　phase)　varied　from　1:3　to　1:6,　the　morphologies　of　the　precursors　Ce-2(C2O4)(3)center　dot　10H(2)O　precipitates　gradually　changed　from　inhomogeneous　blocky-shape　to　uniform　spherical　particles.　The　precursors　could　be　turned　to　CeO2　crystal　particles　with　a　fluorite　structure　by　calcining,　and　the　products　ceria　particles　were　similar　in　the　size　and　morphology　to　the　precursors.