Abstract: A green method of determination of copper ions in acid plating bath using spectrophotometric was introduced.The complex compound has an absorption maximum at λ(=450 nm).It was in accordance with Lambert-Beers Law when the concentration of copper ions was in the range of 1.0~8.0 μg/mL.The linear correlation coefficient is 0.998 05(r = 0.998 05).The average recovery is 101.4,and the RSD(addition standard recovery) is 3.06.The result of the content of copper ions in acid plating bath determined with this method is consistent with the result determined with atomic absorption spectrometry.