Abstract: To study the dynamic response of bedding slope rock under blasting load, numerical simulation method is used to analyze the propagation law of velocity and stress field of the slope. Goodman unit is used to simulate the relative slip of rock masses on both sides of the structural plane. The results show that the change of the slope shape at the step of the slope will cause the vibration velocity and stress value of the particle to fluctuate significantly, and the "whiplash effect" of the protruding part of the slope step is obvious, but the vibration velocity and stress do not reach the peak at the same part of the slope. Therefore, it is unreasonable to use the peak vibration velocity or stress value as the single index to evaluate the stability of the slope. The dynamic response of the internal mass of the rock mass is mainly related to the factors such as medium damping, structural plane and slope shape. The existence of the internal structural plane will cause the reflection of the explosion stress wave to be superimposed, and the vibration velocity and stress value of the particle point will also be enlarged to some extent before the structural surface. The reflection superposition effect of stress wave on the free surface should not be ignored