Mg-Mo-V-Ti　catalysts　of　low　temperature　denitrification　were　prepared　by　dipping　method.　In　order　to　study　the　activity　of　selective　catalytic　reduction,　the　catalyst　was　placed　in　a　fixed　bed　reactor.　Industrial　flue　gas　was　simulated　with　cylinder　gas.　Results　indicate　that　the　0.1wt%　content　of　MgO　catalyst　has　good　performance　on　denitration　activity　and　sulfur　resistance.　The　effects　of　oxygen　content,　space　velocity　and　reaction　temperature　on　the　activity　of　the　0.1MgO-6MoO3　-3V2　O5　-TiO2　wt%　catalyst　were　investigated.　With　the　increase　of　oxygen　concentration,　the　denitrification　efficiency　increases　when　the　oxygen　concentration　is　less　than　8%.　When　the　oxygen　content　is　greater　than　8%,　the　denitrification　efficiency　is　almost　the　same.　The　denitrification　efficiency　decreases　with　the　increase　of　space　velocity.　The　removal　efficiency　of　NO　0.1MgO-6MoO3　-3V2　O5　-TiO2　wt%　catalyst　over　increases　first　and　then　becomes　stable　with　the　increase　of　temperature,　and　the　conversion　efficiency　of　SO2　is　less　than　or　equal　to　2.2%　at　120~240　°C.　©　2018　Trans　Tech　Publications,　Switzerland.