Through the Yan’an geological disasters detailed investigation and statistical analysis,the devel-opment types and features of unstable slopes in research area were summarized as follows:Loess unstable slope, rock unstable slope and loess-rock unstable slope were including in the structure types,and the loess unstable slope was in the majority.The deformation failure pattern was divided into three species as like slip (creep)-cracking pattern,slip-compression cracking pattern and bending-cracking pattern,and slip (creep)-cracking pattern was most common.The instability trend of unstable slopes was divided into landslide and collapse.Controlling by the rock-soil structure types,structure plane,slope angle,height and shape of unstable slopes,collapse was the major instability trend.%通过对延安市地质灾害详细调查及统计分析，总结出区内不稳定斜坡发育类型及特征为：结构类型包括黄土不稳定斜坡、基岩不稳定斜坡和黄土－基岩不稳定斜坡，其中以黄土不稳定斜坡为主；变形破坏模式主要分为滑移（蠕滑）－拉裂模式、滑移－压致拉裂模式和弯曲－拉裂模式三类，其中以滑移（蠕滑）－拉裂模式最为普遍；斜坡发展失稳趋势为滑坡和崩塌，其中受斜坡岩土体结构类型、结构面、坡度、坡高及坡型等多因素控制，区内不稳定斜坡发展失稳趋势主要表现为崩塌。
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