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The spectrophotometric characteristic of a new reagent 1, 4, 9, 12-tetraaza Cyclo-2, 3, 6, 7, 10, 11 , 14, 15- tetrabenzocetanan-5, 8, 13, 16-tetraone (TCTCT) and its complex with Cu(Ⅱ) were studied. The reagent and its complex with Cu(Ⅱ) have a similar maximum absorbance at 446 nm. In C6H4(C2O4HK)-NaOH buffer (pH=4.00), the complex of Cu(Ⅱ)-TCTCT formed when it was heated. The absorbance increased with the increase of the concentration of Cu(Ⅱ) in the range of 1.6×10-7-5.5×10-5mol/L. The composition ratio of the complex was formed to be 1:1 using the molar ratio method. The method was simple, rapid and sensitive, giving an apparent molar absorptivity of 1.25×105L.mol-1.cm-1and the apparent stability constant of 1.04×106. The method was directly applied of copper in fresh milk.