The comprehensive study of the upper 55.34m of core TJC-1 taken from the western Bohai area on sediment lithology, multi-method dating and high resolution spore-pollen data suggests that the changes in pollen assemblage since late Pleistocene are resulted from the joint effects of vegetation,climate and sea-level changes.Conifers,broad-leaved trees and herbs show a regular and cyclic pattern of variation,which indicates a frequent alternation of warm-wet and cold(cool)dry climatic conditions,in addition to significant sea level fluctuation.During the periods of MIS5e,MIS5c,MIS5a,MIS3 and MIS1(early-middle Holocene),mixed coniferous or deciduous broad-leaved forest were developed in the surrounding upland, and lacustrine-halobiotic grass prevailed on the coastal lowland in warm-wet conditions,indicating a coastal or shallow sea environment.There is a thin layer of LGM deposits in MIS2.During the periods of MIS5d,MIS5b,MIS4,and MIS2, conifers prevailed on the upland,and Artemisia-Chenopodiaceae dominated herbs in the lowland area under a cold(cool)- dry climate and low sea level.