A　series　of　Mn-Ti　oxide　catalysts　were　synthesized　by　the　sol-gel　method　and　the　effects　of　different　synthesis　conditions　were　investigated　in　sequence.　The　microstructures　and　properties　of　the　catalysts　were　characterized　by　using　N-2　adsorption-desorption,　XRD,　SEM,　H-2-TPR,　NH3-TPD,　Raman　and　XPS.　The　catalytic　performance　over　Mn-Ti　oxide　catalysts　prepared　under　different　synthesis　conditions　for　the　low-temperature　SCR　of　NO　with　NH3　were　also　comparatively　evaluated.　The　results　reveal　that　the　calcination　temperature　and　metal　source　play　a　significant　role　in　the　characteristics　and　the　SCR　activities　of　the　catalysts.　A　relatively　low　calcination　temperature　is　beneficial　to　low-temperature　SCR　activity.　Manganese　nitrate　or　manganese　acetate　as　the　Mn　source　combining　with　tetrabutyl　titanate　as　Ti　source　can　achieve　high　SCR　activities.　The　excellent　low-temperature　NH3-SCR　activity　can　be　ascribed　to　the　appropriate　textural　properties,　amorphous　Mn-oxides　with　equal　ratio　of　Mn3+/Mn4+,　good　low-temperature　reducibility　and　abundant　surface　B-acid　sites.　[GRAPHICS]　.