Based on the theory of Vail classical sequence stratigraphy, according to the outcrop, drilling, logging and seismic data, sequence stratigraphy of single well in Changxing Formation of Yuanba Area was divided. Characteristic of sequence stratigraphy of single well was analyzed, and sequence stratigraphy of typical profiles in connected wells was laterally compared by the means of three-dimensional seismic, and sequence stratigraphic framework was established. Sedimentary facies layouts were obtained by the overlay between palaeolandform map and seismic facies, and the characteristic and evolution rule of the layouts in different system tracts were discussed.