Abstract：It is of great importance to obtain the reasonable results of stability analysis of rocky slope by using the engineering geological information to establish the correct calculation model. The model is performed based on the slope structures，which are established from geological information. There are many differences between slope structures and rock masses because rock mass of slope will be encountered with the epigenetic reformation and natural forces. The main difference is that rock mass of slope has the special engineering geological properties，such as traces of epigenetic reformation，the surface weathering，rock mass stress relaxation，erosion of surface water and so on. The rocky slope structure now only contains rock masses and its geological tectonic surfaces，and it will necessarily be enriched by these properties. The reasonable model of stability analysis for rocky slope may be obtained by the slope structure. Rocky slope structures will be first analyzed；and the differences can be obtained. Some key issues for the rocky slope structure，i.e. characteristics of the epigenetic reformation，the action scope of natural factors on slope and the boundary to establish geological mechanical model，are discussed. Many special engineering geological characteristics of slope rock mass，rock-soil slope examples，discontinuities，faults，groundwater，key slide surfaces，calculation parameters and so on can be achieved by the slope structures. The 2D or 3D reasonable results of the stability analysis of slope structures are verified.
