Abstract：Usually，there are densely distributed small instable rocks in a low-angled stratofabric rock slope. Topographical condition，lithologic characteristics and rock mass structure of the slope control small instable rocks¢ stability，and the influencing factors include strong rainfall，earthquake，and human¢s cutting works，etc.. The failure models for a small instable rock distributed on a low-angled stratofabric rock slope are suggested with tilting-collapsing，splitting-collapsing and sliding-collapsing. If the slope¢s rockmass is low counter-inclined or thick-interbedded with soft interlayer，its failure model is inclined to be tilting-collapsing；if the slope¢s rockmass is homogeneous and thin-bedded with hard discontinuity，its failure model is inclined to be splitting-collapsing；if the slope¢s rockmass is low sequence-inclined with densely deep tectonic joints and weathering fissures，its failure model is inclined to be sliding-collapsing. Then，the stability evaluation methods for these failure models are deduced respectively. By taking a steep slope behind the reparation workshop for example，the stability evaluation methods for small instable rocks distributed on low-angled stratofabric rock slope are systematically discussed. The research result shows，it is indispensable to investigate rockmass structure and analyze slope¢s failure model in small instable rocks¢ stability evaluation.
