A　combination　of　large　void　volume　and　rich　microporous　structure　enables　expanded　graphite　(EG)　to　possess　excellent　adsorption　properties.　Furthermore,　it　is　discovered　to　be　hydrophilic　with　the　capability　of　adsorbing　NOx.　The　ball　milling　method　was　applied　in　preparation　of　the　MnOx/TiO2　modified　by　expanded　graphite　catalysts　with　the　aim　to　improve　SCR　activity　and　resistance　to　H2O　and　SO2.　An　optimal　SCR　performance　was　obtained　over　the　catalysts　with　5　wt%　EG　doping.　Subsequently,　an　investigation　was　conducted　by　XPS,　NH3-TPD,　H-2-TPR　into　the　understanding　of　the　SCR　catalytic　performance　of　MnOx/TiO2　at　low-temperature.　As　revealed　by　the　investigation　results,　the　catalyst　modified　by　EG　had　more　Mn4+　species　and　could　absorb　more　oxygen,　which　allowed　it　to　present　more　surface　acid　sites　that　could　boost　SCR　activity.　In　addition,　it　was　discovered　that　the　introduction　of　EG　could　facilitate　the　improvement　on　the　resistance　to　H2O　and　SO2.　Graphic　Expanded　graphite　(EG)　has　used　to　improve　the　SCR　activity　and　resistance　to　H2O　and　SO2　over　the　MnOx/TiO2.　The　catalyst　with　the　addition　of　5%　EG　was　found　to　have　more　surface　acid　sites,　surface　adsorbed　oxygen　and　Mn4+　species.　[GRAPHICS]　.