Abstract: In order to obtain more accurate numerical simulation of blasting load equivalent way，based on the basic theory of strength subtraction analysis on slope stability，and aiming at special blasting load in the open-mine blasting，a equivalent loading method to accurately simulate the actual blasting load is proposed.Then，the equivalent loading method is used to analyze the open-pit mine blasting load.Blasting load is transmitted by the explosion source center to around，and the blasting load is equivalently loaded to the border of crush zone，which are more consistent with the actual hole blasting load.With FLAC3D software，the numerical model for open-pit mine slope is established to analyze the dynamic response of the slope under blasting dynamic load characteristics.With application of the strength subtraction，the dynamic safety factor of open-pit mine slope is calculated.Finally，through comparing with past equivalent method that imposes the blasting vibration to the boundary of the model，it is verified that this equivalent method applied to the slope stability analysis under blasting dynamic loading is feasible and rational.

Key words: Open-pit mine, Slope stability analysis, Blasting load, Load equivalent, Strength subtraction