Abstract: The Wuerxun Depression, a sub-basin of the Hailar Basin, covers an area of 2350km². The Upper Jurassic Damoguaihe Formation, which is a significant hydrocarbon generating and reservoiring sequence and up to 2000m thick, can be divided into two seismic sequences and four subsequences. According to the study of seismic and sedimentary facies, it can be primarily classified as nearshore subaqueous fan, offshore turbidite fan,longitudinal transported turbidite body, non-fan turbidite body, delta, beach and bar. The formation, evolution and spatial distribution of these sedimentary bodies were controlled by tectonic movement, lake-level changes and sediment supply.