The author takes more comprehensive measurements of the characteris-tics of TNT dust explosion(the lower limit of explosion and the minimum ignition energy)under the condition of two types of sizes(160～200 item and below 200 item)and different temperatures

and studies the influence of detay time

elec-trode gap

energy-storaging capacitor

discharge resistance in series

environment humidity

spray-air pressure and dust concentration to the characteristics of dust explcsion

and obtains a tentative demonstration of the explosion mechanism of volatile explosive dusts.