Abstract: Rock fragmentation plays a pivotal role in the debris process of high-speed remote landslides.The internal structure of the rock block controls the characteristics of deformation and destruction as well as the run-out distance of the sliding body.To investigate whether different joint settings produce different fragmentation effects, runout distances and depositing of rock accumulation under dead weight effect, we carried out physical model test in this paper.Based on the test, we consider the effect of horizontal, vertical, transverse joints and combination of joints on the slider instability-accumulation process.By varying the joint orientation and combination form, eight different combinations of sliders were set up to slide down under dead weight.The crushing and accumulation of the test blocks as hitting the floor was recorded by a high-speed camera.The pattern of the crushing as the test block hits the floor was analyzed.The deposition distance and accumulation mass curves were obtained by manual measurements, and a relative break-up rate was introduced to quantify the degree of break-up of the residue test block.The energy consumption ratio of the fragmentation is induced by the motion parameters obtained from the image processing method, and then the relationship between the characteristics of fragmentation, the run-out distance, and the energy consumption ratio is investigated.The results show that:(1) According to the contact mode of the slider, the failure models are divided into impact crushing, secondary impact crushing and sliding friction crushing;(2) In the presence of vertical joints, horizontal and vertical combined joints, the fragmentation degree and movement distance of the slider increase significantly;(3) The run-out distance and the dissipation ratio of energy all show an increasing trend with the increase of relative crushing rate.