Abstract: Taking the Hongqi Iron Mine in Guichi district in Guizhou province as a case，the rock mass quality classification is determined by adopting the filed investigation，sampling and testing method，the strength reduction is done by using the relevant methods to conduct the stability calculation，combined with the actual situation of the iron mine，the mine status seepage filed analysis is done，based on the above analysis results，the mining area status stability is calculated by adopting the finite element method，besides that，the influence of the open mining pit to underground mining area are conducted stability analysis and evaluation.According to the established analysis calculation model，the stability of the later mining of the iron mine is analyzed and predicted，the corresponding control measured of the mining security risks of the iron mine are proposed.

Key words: Strength reduction, Old open pit, Finite element method, Seepage field analysis, Security and stability