Abstract: In view of the slope stability problems in the process of development and mining of hanging wall ore of Washan pit，the main pit of Nanshan Iron Mine，three monitoring methods including monitoring radar of stability，deep multi-point displacement meter and drilling dynamometer are adopted to realize real-time monitoring on slope and to establish a three-dimensional monitoring network of slope surface displacement，deep displacement and deep stress.According to monitoring and analysis，it is concluded that：blasting vibration is the main external factor affecting slope stability，and the preferred structural plane is the major internal factor affecting slope stability；Slope internal stress rate is considered as a criterion of the slope instability and is more advanced compared with the displacement rate；The multivariate information monitoring network of the slope surface displacement，deep multi-point displacement and deep stress monitoring is established to effectively predict the stability of the slope and ensure mining safety of hanging wall ore at stope.

Key words: Slope stability, Multivariate information monitoring, Mining of hanging wall ore, Instability criterion