Abstract: The concrete plank is an object usually found in thedemolition blasting. It is the basic piece of structure or building.Attenuation rule of the peak value of explosion stress wave vs. distances isone of the theoretical bases for designing engineering blasting parameters.Through numerical computation, attenuation rule on the peak value of explosionstress wave vs. distances in the concrete plank is studied in this paper. Thestudy results show that the attenuation of explosion stress wave is morerapid in the concrete plank, compared with that in the infinite concrete medium.The attenuation exponent of the peak value of stress wave vs. distancedecreases with increase of explosive charge mass. The change ratio ofattenuation exponent decreases rapidly with increase of explosive charge.That can explain that big explosive charge mass cannot improve thebreaking quality of concrete plank, which will produce strong airshock wave and flying pieces and that the bigger explosive consumption per cubicconcrete should be taken, compared with blasting of concrete body, as can beseen from the results in the paper.