Abstract: Mankong limestone open-pit mine has a large mining depth and poor lithology. The stability ofstope slope is directly related to the normal operation of the mine, and it also affects the rationality of themine's deep extension mining design. Therefore , the analysis and evaluation of its slope stability is very im-portant. According to the engineering geological conditions and rock mass quality evaluation, FLAC andslide 6.0 software are used to establish slope model, calculate and analyze the slope stability of each subar-ea. The slope safety factors are calculated respectively under three working conditions: self weight, selfweight +blasting and self weight + earthquake. The results show that the slope of open pit mine end bound.ary is stable with some security reserve, and slope stability achieves the safety grade and meets require-ments of codes concerned in all working conditions, which illustrates that the slope structure parameters otthe end stope design is feasible and rational to some degree. At the same time, it is suggested that smoothblasting and presplitting blasting should be adopted when the slope is close to the slope design boundary.

Key words:  stope slope, open pit, stability: safety factor: limestone