Abstract: Aiming at the change of mine gas safety situation, we research propagation law of gas explosion in excavation roadway by experimental pipe of 0.1 m×0.1 m diameter and 20 m length. The results show that flame propagation speed increased first and then declined after the explosion in excavation roadway due to the local gas overrun. The peak value of overpressure is "double concave-shaped" along the pipe. In addition, the relationship between flame propagation speed and peak value of overpressure can be divided into four stages.