Abstract: Slopes of open-pit mine and ash storage are likely to result in the geological disasters of landslides，collapse，ground deformation and so on，due to its geological structure and mining activities，etc.Laizhou Power Plant is going to use the open-pit of Cangshang gold mine as ash storage field.Therefore，the long-term stability of the slope is of great significance.Through the geological investigation and analysis of open-pit mine slope of Cangshang Mine，the geological and tectonic conditions of ash slopes are summarized.On the basis of field monitoring，the stability of the slopes is analyzed in detail.The estimated results can better reflect the actual stability of the open-pit slope.Feasible treatment scheme is put forward according to the engineering practice.

Key words: Open-pit, Slope stability, Control scheme, Evaluation