Abstract: In order to study the propagation process of shock wave in the tunnel under different explosion yields and different charge positions, a test tunnel was established to meet the needs of personnel and equipment. The effects of charge amount and charge position on the overpressure time history curve and shock wave parameter distribution were compared by experiments. The same simulation calculations were carried out under the same experimental conditions, and combined with the simulated pressure contour diagram and overpressure time history curve, it was found that the wavefront motion was the main reason for the evolution of the overpressure time history curve and the change of parameter distribution. Based on the experimental and numerical simulation results, a prediction model of shock wave overpressure in the tunnel considering the aspect ratio of the tunnel cross-section size and width is obtained.