Ce-2(C2O4)(3)　center　dot　10H(2)O　powders　with　different　morphologies　were　prepared　by　homogeneous　precipitation　method　at　different　temperatures.　The　source　materials　were　Ce(NO3)(3)center　dot　6H(2)O　and　dimethyl　oxalate　(DMO)　with　a　molar　ratio　of　1:7.5.　The　phase,　morphology　and　property　of　the　products　were　characterized　by　XRD,　TEM　and　TG-DTA.　The　results　showed　that　the　product　was　Ce-2(C2O4)(3)center　dot　10H(2)O　with　a　monoclinic　structure,　and　the　products＇　crystallization　degree　could　be　enhanced　by　increasing　the　reaction　temperature.　The　reaction　temperature　had　direct　influences　on　the　particle　morphology　and　size.　When　the　reaction　temperatures　were　30,　50,　65,　85　degrees　C,　the　morphologies　were　irregular,　spherical,　rice-like,　sheet-like,　respectively,　indicating　the　reaction　course　to　be　temperature　sensitive.　The　reaction　mechanism　actually　related　to　nucleation　velocity　and　growth　rate　of　the　grains,　and　it　followed　LaMer　model　and　crystal　distributions　and　control　principle　during　the　crystal　formation.