Abstract: Borehole BQ1, ca.95.6m in depth, is located in the Qikou Hollow Zone, a secondary subsiding unit of the Huanghua Depression Basement Tectonics, west Bohai Bay. Borehole BQ2, ca.32.8m in depth and 18km away from the BQ1, is drilled in the Dagang Palaeo Buried Hill Belt, a secondary salient unit, in the same Depression. Multidisciplinary studies including lithology (grain size, nodules, colour and facies analysis), palaeontology (molluscs, foraminifera and ostrocoda), chronology (OSL and AMS 14 C) and palaeomagnetism (intensity, inclination, declination and susceptibility), etc. have been carried out. A number of terrestrial layers and marine layers, including transitional layers, are recognized, stratigraphically as the Marine Bed Ⅰ, Terrestrial Bed Ⅰ, Marine bed Ⅱ, Terrestrial Bed Ⅱ, and Marine Ⅲ,… from top downwards for the two cores. A major result reveals that there existed obvious differences on composition, thickness and burial depth of the same layers of the two cores in the Late Pleistocene Period. (1) 80~60kaB.P. , the Terrestrial Bed Ⅱ. In BQ1 it consists of fine sand and silt deposited in alluvial-floodplain-shallow lake environment, with frequent hiatuses; in BQ2 it is composed of clay and silt in floodplain environment. The top of the bed in BQ1 is 16.6m lower than in BQ2 and the thickness of the bed in BQ2 is only one fourth of that in BQ1. (2) 60~35kaB.P. , the Marine Bed Ⅱ. It is intertidal laminated silt and clay or massive mud in bay environment in BQ1 while it is composed of brackish sediments of transitional facies in BQ2. The top and bottom of the bed in BQ1 are 11.5m and 16.5m lower, respectively than in BQ2, while the thickness of the bed in the latter is only a half of that in BQ1. (3) 35~20kaB.P. , the Terrestrial Bed I. During that period, the subsiding unit was a water catchment area and thus the bed in BQ1 consists of well sorted channel sand. That in BQ2 is composed of flooding clay and silt with calcium carbonate nodules, palaeosols and hiatuses. The top and bottom of the bed are 3.9m and 11.5m lower in BQ1 than those of BQ2 and the thickness in BQ2 is only one third of BQ1. (4) 20~10kaB.P. , the Hiatus. It was the Last Glacial Maximum and almost nothing had been deposited in either cores. (5) After 10kaB.P. , the Marine Bed Ⅰ. The thickness of the bed is 13.77m and 13.07m respectively in BQ1 and BQ2 with the similar depositional rates. During 8.6~7.9kaB.P. (uncalibrated AMS 14 C dates), the bottoms of the same layers in two cores are almost at the same level which suggests that the different patterns of depositional process were faded out, and the development of the Holocene coastal plain started with identical tectonic and depositional background.