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The grain boundary structure of Cu alloy was observed and the characteristic of the boundaries was studied,including 70∶30 cupronickel and 7 0∶30 brass. The results show that in the case of the 70∶30 cupronickel thin platelets with nickel and iron e nrichment in it precipitate intergranular so that the alloy was sensitive to sea water corrosion. In the case of 70∶30 brass the situation of grain boundary seg regation of different inclusions made the corrosion resistance of the alloy even worse. All of those were discovered through the corrosion behavior of the two d iff erent copper alloys served in various environments. The experimental methods use d here were, scanning electron microscopy(SEM), transmission electron microscopy(T EM) and energy dispersive of X ray(EDX). The intergranular corrosion morphologie s of those copper alloys served in engineering or exposed to seaw ater for a long term were given.