An eco-friendly route was developed for the synthesis of mesoporous CeO2 powders without any additional template. The original cerum precursors were sepatated from Ce3+ aqueous solution by NH4CO3 via a chemical precipitation method,then H2O2 was introduced to induce the phase transformation from original cerum precursors to CeO2precursors with initial porous structures,finally the crystallinities of CeO2 precursors were improved by a hydrothermal treatment,meanwhile the mesoporous structures of final Ceo2 powders were formed. The BET surface areas of misoporous CeO2powders synthesized using NH4CO3 and Na2CO3 as predipitatant were 106.1 and 76.9 m2 g-1 was also