Abstract: Determination of catrchin in green teas and tea beverages was by carried out wavelength spectrophotometry to ellmlnate the absorbance error of interferlng cpmponents,turbld solutlon and the scattering effect.The Back-ground change with concentration change and asymmetrlc absorptlon and the problems could be solved also.The method was more advantageous than trandltlonal spectrophotometry method.The tecoverwas 95.2%～102.0%and the coefficlent of varlation was 1.05%.

Key words: Catechln , Natural tea and tea beverages, Three wavelength spectrophotometry