The application of principles and methods of sequence stratigraphy, integrated with the seismic, logging and drilling data, we research the sequences and system-tracks for the Jiufotang formation in the west area of Lujiapu sag, and the 2 third grade sequence interface, the 3 fourth grade sequences or system-tracks, are all identified, which including the lowstand system-track, lacustrine transgressive system tract, highstand system-track, and they can be divided separately into 3, 4 and 4 subsequence sets. Thus, the sequence stratigraphy framework for the target formation of project area were formed, analysis system domain characteristics and plane exhibition cloth characteristics and the relationship between sequences growth and sedimentary succession and their distribution characteristics in horizontal and vertical direction, finally, the research achievement can provide a foundation for the further exploration of target formation.