Abstract: The concentration distribution of pulverized coal in blowpipe of blast furnace was measured in an isothermal two-phase model by means of a computer measuring system based on infrared transmission. The results show that concentration near the exit of oxygen-coal lance is distributed unsymetrically and that the concentration along the direction of the gas-solid jet is much higher. The concentration distributions in the distance about 2.5 times diameter of blowpipe from the exit of the lance tend to be uniform due to the mixing of gas and solid phase rapidly in blowpipe.