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Boron element in sediment to quantitatively restablish paleosalinity was applied to analysis regional sediment and geography evolvement character.As the determination the content of B in sedments were dissolved by strong acid, the born was reacted with H+ and formed boric acid which was easy to volatilize.So, a method for the determination the content of B in the salt lake sediments was developed by using pressed power method to prepare the sample and X-ray fluroescence spectrometry to construct the standard curve As the salt lake sediments was a kind of special samples,the condition experiment of particle size and pressure was developed.