Abstract:The stability of open-air slope is influenced by many factors, such as rock, rock structure, hydrogeology, slope form and blasting. Geological hazards such as slope instability and landslides in open pit directly threaten the normal production of open pit. In order to study the stability of the existing slope of Yinshan Mine, a three-dimensional model of Dimine software was established, the force state of various destruction modes of the slope was analyzed by engineering geological partition and limit balance method, the stability of the slope slope was evaluated by the relationship between the anti-slip and the sliding force on the slope slide, the overall slope slope of the surface of the analysis was stable, and the monitoring of the slope on the southern follow-up should be strengthened in the process of the southern follow-up mining, and the safety hazards were eliminated in a timely manner.