A　series　of　CeO2-TiO2　mixed　oxides　catalysts　prepared　by　Co-precipitation　method　was　investigated　on　selective　catalytic　reduction(SCR)　of　NOx　with　NH3.　The　properties　of　the　catalysts　were　characterized　using　XRD,　BET,　XRF,　XPS,　H-2-TPR,　NH3-TPD　and　NO+O-2-TPD　techniques.　The　results　indicated　that　the　crystal　structure,　crystallite　size　and　catalytic　NH3-SCR　activity　over　the　catalysts　presented　a　regular　change　with　the　increase　of　CeO2　concentration.　Particularly,　the　50CeTi　catalyst　with　amorphous　structure　of　CeO2-TiO2　showed　a　higher　BET　surface　area　and　a　stronger　surface　acidity　than　other　samples.　Meanwhile,　favorable　Ce3+　and　the　surface　adsorbed　oxygen　benefited　the　adsorption　of　NOx　and　NH3　molecules,　which　enhanced　DeNO(x)　performance.