An engineering example of Wanglong slope with gently anti-inclined red bed was studied.A conceptual model was first established based on the results of field investigation and geological analysis.Then the deformation and failure mechanism of gently anti-inclined red-bed slope in Guizhou was discussed through discrete element numerical simulation.The results show that Wanglong slope in Chishui City is a typical red-bed slope in Guizhou province with gently anti-inclined bedding and interbedded sand and mudstone of unequal thickness.Differential weathering and rainfall are the two important inducing factors for slope failure.The deformation process of the slope undergoes four stages

that is

unloading rebound

shallow epigenetic transformation and local deformation

fracture extension and propagation

fracture coalescence and deep creeping.The deformation and failure mechanism are divided into three different forms according to deformation stages:compression-cracking and dumping

weathering-spalling and falling

creeping-compression cracking.