With core，thin section，grading analysis，well log and seismic data，the types and sedimentary characteristics of sediment gravity flows of Ed3 Member in the east slope of Chengdao area，Bozhong Sag are studied，and the distribution of gravity flows sand is summarized to establish the gravity flow sedimentary models of the slope zone with gullies and slope breaks on it. Hyperpycnal flows，sandy debris flows，and turbidity currents are developed in Ed3 Member of the study area，according to the results. Hyperpycnal flows account for the largest proportion and are widely distributed in the first slopebreak zone，the second slope-break zone，sub-sag zone，and southeastern gullies in the central north of the study area. Inversely graded to normally graded mixed bedding as well as overstep of normally graded bedding and intrastratal erosion surface are developed in channels；massive，parallel，climbing ripple，and wavy bedding is developed in lobes；carbon dusts are seen mostly in sediments. Sandy debris flows are distributed under slope-break zones and in gullies where sedimentary structures such as massive bedding，planar structures，floating mud gravel，and coarse sand mass in fine sandstone are developed. Turbidity currents are distributed in the sub-sag zone where the Bouma sequence is developed，which is mostly thin interbedding of siltstone and lacustrine mudstone. The development of gravity flow sands is controlled by gullies and slope breaks. The sands are in a zonal distribution along gullies，and pinches out under slope breaks，forming a series of independent sands with poor continuity，which is of great significance for oil and gas exploration.