In order to study the law of altitude amplification effect of blasting vibration on the slope in open pit,a groove model is established based on slope topography and the wave theory,and the reflection superposition and diffraction effect of blasting vibration wave are analyzed.Then on the basis of Sadov’s formula,the correction formula of blasting vibration speed attenuation is deduced,and the correction formula is verified by the actual measurement data.The results show that the altitude amplification effect of the open pit slope is the result of the reflection superposition and diffraction of the blasting vibration wave inside the slope.The correction formula is more accurate and more suitable for the prediction of blasting vibration speed of the open pit slope terrain.