In　cement　kiln,　the　alkaline　substance　in　the　smoke　causes　catalyst　poisoning.　The　Mn-Ce/TiO2　catalytic　material　for　low-temperature　SCR　of　NOx　with　NH3　was　prepared　by　sol-gel,　impregnation,　hydro-thermal　method　and　co-precipitation　method.　Based　on　the　results,　the　effect　of　the　co-precipitation　method　is　the　best　in　the　low-temperature　with　better　NOx　reduction　rate　and　capable　of　alkali　resistant　poisoning.