In　the　present　study,　a　series　of　CeO2/TiO2　catalysts　were　fabricated　by　dry　ball　milling　method　in　the　absence　and　presence　of　organic　assistants,　and　their　catalytic　performances　for　the　selective　catalytic　reduction　(SCR)　of　NO　by　NH3　were　investigated.　It　was　found　that　the　addition　of　organic　assistants　in　the　ball　milling　process　and　the　calcining　ambience　exerted　a　significant　influence　on　the　catalytic　performances　of　CeO2/TiO2　catalysts.　The　nitrogen　sorption　isotherm　measurement　(BET),　powder　X-ray　diffraction　(XRD),　Raman　spectra,　high-resolution　transmission　electron　microscopy　(HR-TEM),　hydrogen　temperature-programmed　reduction　(H-2-TPR),　ammonia　temperature-programmed　desorption　(NH3-TPD),　sulfur　dioxide　temperature-programmed　desorption　(SO2-TPD),　thermogravimetric　analysis　(TG),　Fourier　transform　infrared　(FT-IR)　and　X-ray　photoelectron　spectra　(XPS)　characterizations　showed　that　the　introduction　of　citric　acid　in　the　ball　milling　process　could　significantly　change　the　decomposition　process　of　the　precursor　mixture,　which　can　lead　to　improved　dispersion　and　reducibility　of　cerium　species,　surface　acidity　as　well　as　the　surface　microstructure,　all　which　were　responsible　for　the　high　low　temperature　activity　of　CeTi-C-N　in　an　NH3-SCR　reaction.　In　contrast,　the　addition　of　sucrose　in　the　milling　process　showed　an　inhibitory　effect　on　the　catalytic　performance　of　CeO2/TiO2　catalyst　in　an　NH3-SCR　reaction,　possibly　due　to　the　decrease　of　the　crystallinity　of　the　TiO2　support　and　the　carbon　residue　covering　the　active　sites.