To　better　reveal　the　pore　structures　and　adsorption　characteristics　of　iron　sulfide　ores　after　the　mechanical　activation,　the　raw　sulfur-rich　ore　obtained　from　a　sulfide　mine　was　activated　into　several　samples　under　different　billing　conditions.　Both　the　scanning　electron　microscopy　(SEM)　and　low-temperature　N-2　gas　adsorption/desorption　(LT-N(2)GA)　methods　were　used　to　understand　the　features　of　the　pore　structures,　such　as　the　pore　volume,　specific　surface　area　(SSA),　and　pore　size　distribution　(PSD).　Moreover,　the　Frenkel-Halsey-Hill　(FHH)　model　was　applied　to　determine　corresponding　fractal　dimensions.　The　research　results　indicate　that　the　N-2　adsorption　of　the　activated　samples　mostly　takes　place　in　the　mesopores　ranging　from　2　to　30　nm.　The　change　order　of　the　SSA　and　pore　volume　for　the　activated　samples　with　different　sample-ball　ratios　is　as　follows:　a　(1:2)＜　b　(1:4)＜　c　(1:6);　and　that　with　diverse　milling　rates　is　as　follows:　d　(200　r/min)＜　e　(400　r/min)＜　f　(600　r/min).　The　transformations　in　the　fractal　dimensions　agree　with　those　in　SSA　and　pore　volume　development,　while　the　alterations　are　on　the　contrary　in　average　pore　diameter.　The　mechanical　activation　can　increase　the　fractal　dimensions　of　iron　sulfide　samples　and　alters　their　oxygen　adsorption　properties,　so　it　promotes　the　tendency　of　iron　sulfide　ores　to　oxidation　and　spontaneous　combustion.