Abstract:Analyses of pollen, micro-palaeontology,radiocarbon dating and factor analysis showed that, the evolution of vegetation and geographical environment in the west coast of Bohai Gulf since 25000a. B. P. was influenced by both climatic changes and sea level fluctuation. During the period of 25000—23000 a. B. P. the sea level was high, the vegetation type was forest and grassland. During 23000—12000a. B. P., it was cold and dry, with low sea level and grass-land vegetation type, but grass moor vegetation appeared at the beginning and the end of this period. Period from 12000—5000a. B. P. was a perios of sea level rising and a period of climatic change from cool to warm and humid,with the vegetation of broad-leaves forest and grass or grass swamp. After 5000a. B. P., it became cool and dry. It was a regression period of sea level, with a vegetation succession from grass swamp to salt meadow.