An　investigation　on　reducing　low-grade　manganese　dioxide　ore　pellets　was　carried　out　by　using　wheat　stalk　as　reductant.　The　main　impact　factors　of　reduction　percent　such　as　particle　size,　biomass/ore　ratio,　heating　rate,　nitrogen　flow　rate,　temperature　and　time　in　reduction　process　were　discussed.　The　morphology　and　component　of　manganese　dioxide　ore　particle　at　different　stages　were　also　analyzed　by　scanning　electron　microscopy　(SEM)　and　energy　dispersive　X-ray　spectroscopy　(EDS).　The　results　show　the　increase　of　the　reduction　temperature　and　time,　biomass/ore　ratio,　and　the　decrease　of　particle　size,　heating　rate　and　nitrogen　flow　rate　can　significantly　enhance　reduction　efficiency.　The　reduction　kinetic　of　the　manganese　ore　is　controlled　by　three-dimensional　mass　diffusion　of　gaseous　reductive　volatiles　passing　from　the　surface　to　the　core　of　the　ore　particles.　The　activation　energy　E　and　frequency　factor　A　were　calculated　to　be　24.15　kJ.mol(-1)　and　166　min(-1),　respectively.　Biomass　pyrolysis　volatiles　adsorbed　onto　the　surface　of　the　ore　particle　leads　to　serious　variation　of　the　microstructures　and　chemical　composition　of　the　manganese　ore　particles.