Based on sequence stratigraphy, seismic sedimentology theory and 3D visualization technology, high resolution three-dimensional facies architecture was described in detail using the recent 3D seismic data of Dongying Formation of BZ3-1 Block, western slope of Bozhong sag. The results of high resolution three-dimensional sedimentary systems analysis show that the third-order sequence located in different system tracts of second-order sequence could be lead to their system tracts with the different sedimentary types and scale.