Abstract: The blasting near slope of Dagushan open-pit iron usually adopts pre-split blasting technology.In order to seek for the optimal pre-splitting blasting parameters，LS-dyna software was used to make numerical simulations of pre-splitting blasting process under different blasting parameters.From analysis on the numerical simulation，the pre-splitting blasting parameters of Dagushan iron mine were achieved，such as the optimal pre-splitting blast hole spacing and the decoupling coefficient.According to the simulated optimal pre-splitting blasting parameters，contrast tests between field coupling pre-splitting blasting and decoupling blasting were made.The retention effect of the decoupling pre-split blasting is notable and the small slope vibration from blasting construction was conducive to maintaining the slope stability，and getting a good pre-splitting blasting effect.The blasting parameters determined by numerical simulation can be applied in Dagushan Iron Mine end-slope blasting，which has practical guiding significance for the on-site construction blasting.

Key words: Pre-split blasting, Blasting vibration, Numerical simulation, Pre-splitting blasting parameters, Decoupling coefficient