CeO2　precursors　were　prepared　by　the　homogeneous　precipitation　method,　hydrothermal　synthesis　method　and　hydrothermal　precipitation　coupling　method　using　urea　as　a　precipitator.　The　results　indicated　that　urea　was　a　reserve　resource　of　CO32-·CeO2　precursors　were　orthorhombic　Ce2O　(CO3)2·H2O,　hexagonal　Ce(OH)　(CO3),　orthorhombic　CeO　(CO3)2·H2O　respectively　when　the　homogeneous　precipitation　method,　hydrothermal　synthesis　method　and　hydrothermal　precipitation　coupling　method　were　used.　The　synthesis　technology　had　a　great　effect　on　the　precursors.　Different　precursors　were　synthesized　through　various　processes　and　mechanisms.　When　heated　up　to　the　temperature　of　500°C,　the　precursors　were　all　finally　changed　into　face　centred　cubic　CeO2　powders.