Abstract: in order to claify the explosion characterstics of the coal in pulverized cal-fred industrial boliers and provide the basis for safety and explosion proof design of coal bunkerthe explosion characteristices of three kinds of typical cal( ligntie sample, and two samples of biuminous coal) in pulveized coal-red industrial oler were studied in th 20 L sphere explosion testapparatus,and the explosion characteritic parameters of thee inds of coal powder were obtaine :themaximum explosion pressure( Pmay).t hemaxinum explosion pressure rising rate( Ymax.and themaximum explosion index( Kmax . The pressure on pulverzed caldust explosion with vlati variation,the ferocty of coal tust expiosion and the infuencing factors were discussed.At the same time ,the safety and explosion proof factors and measuresof coal bunker were researched.T'he results show that the Pmao f the thee inds of coal powder are succssively 0.764 3,0.7569,0.7528MPa.The conent of volatie has a great infuence on the explosion characteristis ofcal nd the higher of the volatle the lager of th Pmaois relatively.The Kmaof the three kinds of coal powder are successively 19.584 5,19.5391,19.2210 MPa m s.The hicher of the volatle the lager of the Kmaxis and the greater ferocity of coal dut explosion is The coal dust concentration coresponding to Kmais related to the conmbustilebasis of the coal The higher of the combustible bas s thelower of the coal dust concentration is reltively. The safety and explosion proof design of pulverized coal bunker of pulverzed coal-ired indusrial biler can be caried out by the method of dense phase operation,closed,inert gas protection,static electricity protection ground and discharging explosion.