Qingmaishan limestone open-pit mine has a large mining depth,and the height of the stope slope formed by the final mining is high,and the slope angle is also steep. As the stability of stope slope directly bear on the normal operation and rational deep mining design of the mine. Therefore,the analysis and evaluation of its slope stability is very important.  According to the engineering geological conditions and rock mass quality evaluation,Limit equilibrium method software are used to establish slope model and calculate and analyze the slope stability of each side slope. The slope safety factors are calculated respectively under three working conditions:self weight,self weight+blasting and self weight+earthquake.  The results show that the slope of open pit mine end boundary is stable with some security reserve,and slope stability achieves the safety grade and meets requirements of codes concerned in all working conditions,which illustrates that the slope structure parameters of the end stope design is some feasibility and rationality.  At the same time,it is suggested that smooth blasting and presplitting blasting should be adopted when the slope is close to the slope design boundary. The research provides guidance basis for the safe mining of the open-pit mine in the future.

slope stability;open pit;BQ method;safety factor , structural plane