A set of lacustrine and fluvial red clastic sedimentary rocks are exposed in east Sichuan, and the slope structures with low dip angles are widely distributed. Due to its special engineering characteristics and environmental conditions, geological hazards occur frequently, among which collapse is one of the main forms and a great threat to the safety of local residents, transportation, urban construction. By summarizing the previous research results and analyzing a lot of engineering mapping and geotechnical mechanics in the field, we proposed four kinds of basic collapse types based on the environment background conditions in east Sichuan, which are penetrating-topple, penetrating-slide, non-penetrating-shearfault and non-penetrating-pullfault. Their lithologic association characteristics, slope structure characteristics, evolution process and security quantitative evaluation are summarized systematically, which provide reference for the treatment and research of similar geological hazard in the region.