Abstract：Providing theoretical basis for reducing shock wave hazard of coal dust explosion to human, mine explosion-proof, explosion suppression and safety evaluation, as well as emergency and rescue, it studyied the spreading law of shock wave after coal dust explosion.Based on the coal dust explosion theory, the study was done on the spreading law and damage law of the shock wave overpressure of coal dust explosion in tunnel though the theoretical analysis and experimental testing.Research indicates that the overpressure of coal dust explosion shock wave is inversely proportional to transmission distance and the square root of tunnel broken area.Theoretical analysis results is basicly responding with the experimental testing.Basing on this, it divided the areas of damage caused by overpressure.

Keyword：coal dust explosion;shock wave;spreading;