Abstract: A limestone mine intends to expand and deepen the boundary. In order to ensure the feasi⁃ bility of subsequent design and production safety，the final slope stability research work is carried out. Through engineering geological investigation and rock mechanics experiment，the key factors affecting slope stability such as slope engineering geological conditions，hydrogeological conditions and rock me⁃ chanics parameters are mastered，and it is determined that the slope of the stope is mainly circular arc fail⁃ ure. The safety factor of the slope under different load combinations is calculated and analyzed. The safety factor of the whole slope is greater than the allowable safety factor，and the stability of the slope meets the requirements of the specification，which verifies the rationality of the design slope parameters.

Key words: limestone ore, rock mass structure, slope stability, factor of safety