Abstract: Under high speed preheat in blast furnace and gasification in iron-bath for smelting reduction the pyrolysis of pulverized coal injection is the first important stage. For study of this pyrolysis of coal in 1160-1750℃, an apparatus was designed. The heated rate by a plasma torch was as high as 4.3×10³-2.4×10⁴ K/s and even more than 105 K/s. The results show that increasing temperature gives more effect on the pyrolysis of bituminous coal than anthracite, but atmosphere seems to be no effect on pyrolysis process. This conclusion shows that in iron-bath process, the solid coal particles and oxydizing agent can be blown in separately. These will be good for controlling over the heat in front of the nozzles and eliminating heavy fume generation.