Seismic geomorphology has provided effective technical support for the study on the sediment dispersal system in poorly drilled area based on seismic data. In this paper, taking the Neogene strata of eastern Liaodong region in the Bohai Bay Basin, eastern China, as an example, strata slicing was performed in the 3D seismic data volume with phase adjustment under the constraints of a few drilling and logging data, which aims to depict the planar distribution and evolution of the sandbodies of Guantao-Minghuazhen Formation layer by layer. One hundred and seventy-five isochronous strata slices of amplitude attribute were extracted in the time domain, which had greatly improved the quality of sandbody planar distribution map and provided an effective method for analyzing the sedimentary microfacies of different periods and their evolution in the study area.