Abstract: The excitation functions have been determined for 36 reaction products from the interaction of copper with 20. 5,24. 0,27. 5,31. 1,34. 8,38. 5,42. 3 and 46. 4 MeV/u 12C ions using nuclear chemical techniques. From these data, charge distribution of mass numbers of A =48 and 56 have been obtained. It is found that the widths of the charge distributions increase slowly with increasing incident 12 C energies. On the basis of assumption of the charge distribution, the isotopic distributions and the mass yield distributions have been calculated.