Abstract:The comprehensive studies of sedimentology, micropaleontology and chronology of borehole LZK06 in 40m depth and combining with the data of boreholes LZK02-04 in Dalinghe estuary area revealed that the study area experienced two transgression-regression since the Late Middle Pleistocene. And the Late Middle Pleistocene lacustrine/fluvial-Late Pleistocene marine-lacustrine/fluvial-Holocene marine-fluvial stratums were formed in turn. In the Early and Middle Holocene, due to the lower supply of provenance, the study area is in a 10ka long phase of starving deposition environment with an average sedimentary rate of 0.02~0.05cm/a. In the Late Holocene, about 1500 years ago, due to the human activities leading to soil erosion and increased sediment transport in the river, the study area began a rapid accretion process with an average sedimentary rate of 0.9~1.2cm/a, and the lower liaohe plain was quickly filled. Compared with the tempo-spatial pattern of global sea level change, it is speculated that the marine bed II was formed in MIS 5-early MIS 3 and marine bed I was formed in MIS 1. Frequent sea level change is the main controlling factor for stratigraphic and environmental evolution in the muddy coast of Liaodong Bay since the Late Pleistocene.