After the palaeomagenetism study on the 500 25 m deep Borehole CK3，which is located near the Xiaoshan volcanic dome of Haixing County on the western coast of Bohai Bay，it can be determined that this borehole has drilled through the strata since the Cochiti subchron of Gilbert polarity chron，with the basal horizon having an age of 4 38 Ma. Combining with ¹⁴ C dating data as well as stratigraphic relations，the total four periods of volcanic activities occurred at 2.12 Ma，1.34 Ma，35～70 ka and 10～15 ka，respectively. The comparison with the high-quality palaeomagenetism-studied boreholes on the coastal plain of the Bohai Bay indicated that the Huanghua Depression was overall tilted northeastwards during the Quaternary. The average grain-size change of sediments and the logging curves showed a good contrastive relationship and synchronicity. The comprehensive analysis of the sediment characteristics，sedimentary structures，log facies and particle sizes suggested that most of the drilled strata were floodplain deposits，and had rare lacustrine-limnetic sediments even in the interdistributary subfacies，while the deposits were mostly in a state of oxidation. All the three periods of transgressive strata since the Late Pleistocene were tidal flat deposits with the burial depth of basal horizons conformed to the entire western Bohai Bay，and could be subdivided based on marine oxygen isotope stages