Abstract: Aiming at the problem of slope landslide in the process of mining in an openpit mine,the method of joint survey of drone tilt photogrammetry and engineering survey was adopted,and the basic precursor characteristics and geological characteristics of slope landslide were analyzed and judged based on multisource data.The results show that the root cause of the slope landslide is that after the highsteep slope is formed by mining,the unfavorable rock and soil mass of the slope produces plastic deformation toward the empty surface during the stress redistribution process,which leads to the formation of steeply inclined tension cracks in the overlying rock.The deformation mode of the slope landslide is mainly creepingtensile deformation (surface creepingtrailing edge tensilepotential shear surface shear),and the main failure mode is slumping.The potential slip surface of the slope will develop in the extremely softweak rock and soil layer.According to the distribution characteristics of limestone,if the slope is finally damaged,the middleshallow landslides will be the main ones.The depth of the sliding zone is mostly within 20 m.The trailing edge of the landslide is in the area where new and old fractures are developed,the cutting exit is located above the +250 m platform.The results provide a theoretical basis for slope stability control.

Key words: mine slope, drone tilt photography, engineering investigation, multisource data