Abstract: Amethod for the solvent extraetion-spectrophotometric determination of palladium with 2-mercapto-β-naphthothiazole（MNT）has been studied.The complex in acidic solutions,palladium（Ⅱ）reacts with MNTto form a complex which can be extracted into organic solvent phase,benzene and so on.The absorption maximum of the palladium complex in benzene was found at 440nm with apparent molar absorption coefficient of l.01×10⁴ mol^-1cm^-1.The complex can be quantitatively extracted with benzene from the range of pH0～3,but not from alkaline solution.Beer's law is confirmed over the range of 0～100μg of palladium in10 ml of benzene.