In recent years，commercial oil flow has been obtained in the lithologic reservoir found in Well Niu119，Niu100-side，and Feng14 where reservoir is known as slope-shifting fan. This reservoir rock is obviously different from turbidite and is presumed to be detached from the main delta and not completely liquefied. At present，there is little cognition and research on slope-shifting fan. In this paper，the sedimentary characteristics of the slope-shifting fan were studied in details through systematic core observation and outcrop description. The distribution pattern was established by detailed practical anatomy according to the sedimentary sequence of delta front-slope-shifting fan-turbidite. The results show that under the background of the wide slope zone in the fault depressed lacustrine basin，slope-shifting fan is formed when the front leaf of the delta，which accepts a rich sediment supply and progrades forwards rapidly，fractures under the influence of compressive settlement，earthquake and hydrodynamic conditions of lake water or flood，and then it slides forward，slumps and is fluidized，finally deposits at a suitable background of paleotopography before forming turbidite. This sand body is characterized by large thickness of single layer and multi-superimposed and continuous area. The slope-shifting fan sand has a typical longitudinal sequential pattern which，from bottom to top，successively includes dark color mudstone section，sliding deformation section，tensile deformation section，residual front section and block debris flow section. The slide sand，the slump sand and the debris flow sand，which are distributed in belts horizontally and have different longitudinal sequential patterns，are successively developed from slope belt to depression zone under the influence of sliding distance. Sliding sand/sliding-slumping sand，clastic sand and gravity turbidite are developed successively from slope to subsag area；gravity sands developed in different periods superimpose vertically from bottom to top，which are turbidite，clastic rock and sliding/ sliding-slumping rock.