Abstract: The analys is of the change of trace element content in the upper part of Bore-YA indicat es that the content of B and the ratio of B/Ga,Sr/Ba and Cl/Br are sensitive in dicators of paleo-water salinity.The Bore-YA palaeo-salinity index curve shows,several one-hundred-scale salinity fluctuations occurred in this a rea in the last several thousand years,and they are probably relevant to sea-water inundations and recessions resulted from concurrent sea-level fluctuations.The fact indicates that trace elements in sedimental strata in the coastal area are good proxy for conventional sea-level changing indicators.