Abstract: To study the influence of the cross-section shape of underground gun-driven roadway on the propagation law of blast wave, the distribution characteristics of blast load on the wall surface and the safety and stability of the structure, the finite element method was used to simulate the explosion process of blast wave in three models with square, circular and horseshoe shapes, and the pressure time-history curves of the corresponding characteristic points in the axial direction of the three cross-section shapes and the explosion load time-history curves on the structural wall surface were obtained. At the same time, the evolution process of wave system and the load distribution characteristics of square pipe are obtained for the square pipe scale by corresponding experimental study. The results show that, taking the square model as an example, the attenuation law of the shock wave is consistent with the numerical simulation and experimental results of the wall explosion load distribution characteristics, and the error is less than 15%; the calculation model with horseshoe-shaped section has the smallest explosive load distribution characteristics and the highest safety, but the local area is easy to cause stress concentration.