Drying　process　is　inevitable　for　torrefaction　of　nature　biomass　which　contains　considerable　moisture.　Drying　process　would　retard　the　temperature　building　of　biomass　during　superheated　steam　(SHS)　torrefaction　and　hence　affect　the　torrefaction　process　as　well　as　change　the　properties　of　products.　Feedstocks　with　different　moisture　contents　were　torrefied　to　develop　a　drying　model　to　describe　the　SHS　drying　process　and　predicate　the　temperature　of　feedstock.　Torrefied　biomass　was　analyzed　to　get　its　physicochemical　properties,　pyrolysis　behaviors,　and　combustion　performance.　It　was　found　that　torrefaction　would　occur　during　the　drying　process.　The　drying　process　can　be　roughly　divided　into　three　stages:　the　rapid　cooling　stage,　the　rapid　heating　stage,　and　the　stable　heating　stage.　The　rapid　cooling　stage　and　rapid　heating　stage　are　dominated　by　drying　processes,　while　the　stable　heating　stage　is　usually　accompanied　by　a　severe　torrefaction　process.　Wet　feedstock　need　longer　residence　time　to　achieve　equivalent　physicochemical　properties　and　pyrolysis　behaviors　as　that　of　dry　feedstock.　The　HHV　of　dry　sample　could　be　increased　by　40.8　%,　and　that　of　wet　sample　also　could　be　increased　by　34.77%.　However,　the　combustion　behaviors　of　the　products　have　changed　after　the　thermal　treatment.　It　is　found　that　ignition　and　burnout　temperatures　of　SHS　torrefied　biomass　were　greatly　affected　by　the　initial　moisture　content　in　feedstock.