Abstract:Safety pre-assessment work played a crucial role in the initial stage of a non-coal mine construction, especially for a large open-pit mine. Considering the high & steep slope stability of a large open-pit mine always is the key factors of safety work, this paper adopted the popular rock mechanical analysis method to carry out slope stability work base on the latest pre-assessment work syllabus and slope stability research status. The visualization and measurable pre-assessment result was got. After compared with standard for safety, the pre-assessment work can be accurate and efficient. This paper’s research work promoted pre-assessment work’s theoretical definition, practicability, compliance and so on, and met the requirement of pre-assessment work syllabus.