Abstract: in order to claify the explosive impact factors for ow rank injction coal.accerding to the characterisics of igh volatle and strong explosiveness for owrank blast furnace injection coal ,T he particle size,fineness of the puiverized cal nd blending ratio blending cal olatil afieced to explosion were reseached. Tme rsuts showed that with the increase of coal powder pariclesize and fineness,.he explosiveness became weak gradually until no exlosiveness When pariclesize of tuo kinds of low rank coal from 'Yulin area was less than 0.074 mm.oal power ad strong explosiveness Nhen paricle sze increBsed to 0.104~0.125 mm,the exolosieness significantiy reduced, while increased to 0.15~ 0.25 mm,there was no explosivenes. The pulverzed coal had the strong explosiveness when fnenes was lowerthan 50%,the explosiveness had obvious step characterstics within the range offinen.ess 60%～70%.explosiveness sudenly dropped.The explosiveness o blending oal had a index relatonship with its volatle matter.The volatle mater of blending cal as about24%.the explosiveness had obvious steap characteristcs and bumped up.