Abstract: The causal link of underground mining and landslides is the focus of attention recently. Considering the limitations of previous undermining induced landslide research, the stochastic medium theory has been used widely in ground surface movement and deformation forecast in diggings. It tries to illuminate the slope movement and deformation principle resulted from underground mining with the stochastic medium theory. Taking Jiweishan landslide in Wulong, Chongqing for example, two models of undermining section in the slope are built. With computer aided calculation, the slope movement and deformation principles induced by undermining are analyzed. The different undermining conditions are also considered. The conclusion is as follow. The undermining-induced differential settlements aggravate the tendency to slip of the Jiweishan slope. The analysis indicates the stochastic medium theory is applicable to analyze slope movement and deformation principles induced by underground mining.