The gravel soil accumulation body is the natural stacked loose accumulation body under the action of gravity (Li et al. 2008). The geological conditions of the gravel soil slope is very fragile, if it lost stability, it will have landslides and other disasters (Wu et al. 2014), Shenzhen Bright Hill landslide events caused by the unstable accumulation body made huge losses on December 20th, 2016. The slope stability monitoring of the gravel soil accumulation body is an effective way of early warning of the landslide disasters (Deng et al. 2010 & Yao et al. 2012).