Abstract: Based on the detailed observation and description of cores from 7 wells in P well area in the East China Sea shelf basin, the sedimentary microfacies types and sedimentary models of Pinghu Formation are studied comprehensively with logging, laboratory and seismic data. The results show that the Pinghu Formation in the study area develops a set of transitional sedimentary system, dominated by tidal delta-tidal flat deposits. The sedimentary subfacies mainly include delta front, prodelta and intertidal zone. Seven sedimentary microfacies, such as underwater distributary channel, mouth bar, interdistributary and tidal channel, are further identified. The distribution of sedimentary microfacies is obviously affected by the syngenetic fault. Where the fault throw is small, the underwater distributary channel sediments will be diverted with the increase of the angle between the provenance and the strike of fault. While at the places with large fault throw, the sediments will be deposited only in the lower part of the hanging wall of the contemporaneous fault, with limited advance to the center of the basin. Based on the analysis of sedimentary system, the sedimentary model of tidal delta front in the study area is established.