Major　sulfur　components　in　0#　diesel　conformed　to　PRC　State　Standard　II,　Standard　and　Standard　IV　were　identified　by　a　gas　chromatograph　(GC)　equipped　with　a　pulsed　flame　photometric　detector　(PFPD).　The　PFPD　chromatograms　illustrated　that　benzothiophene　(BT),　dibenzothiophene　(DBT)　and　their　derivatives　constitute　significant　portion　of　the　sulfur　species　in　ORD,　majority　of　which　were　derivatives　of　DBT.　BT,　DBT　and　4,　6-dimethyldibenzothiophene　(4,　6-DMDBT)　were　treated　as　the　characteristic　sulfur　species　in　diesel.　The　hindered　diffusion　coefficients　of　characteristic　sulfur　species　in　different　sizes　pore　were　estimated　by　a　simplified　hindered　diffusion　model.　By　combining　with　the　stacking　pore　model　of　alumina,　the　appropriate　pore　size　distribution　for　fuels　desulfurization　adsorbent　was　estimated.　The　results　showed　that　when　the　average　pore　diameter　of　the　alumina　is　4-10　nm,　the　hindered　diffusion　coefficients　of　characteristic　sulfur　species　were　about　0.24　to　0.65　and　the　specific　surface　area　of　the　alumina　was　about　100-250　m2·g-1,　which　can　meet　the　lower　diffusion　resistance　and　a　sufficiently　large　specific　surface　area,　simultaneously.　There　was　a　significant　positive　correlation　between　the　desulfurization　rate　of　0#　diesel　conformed　to　PRC　state　standard　II　and　the　percentage　of　pore　area　in　the　range　of　4-10　nm.　It　was　preliminary　conjectured　that　the　appropriate　pore　size　distribution　of　alumina-based　adsorbent　for　fuels　desulfurization　was　in　the　range　of　4-10　nm.　©　All　right　reserved.