In the framework of the transport theory, the distribution of coherent
energy width versus N/Z in the F-19 + V-51 dissipative reaction is ex
tensively discussed. It can be concluded that the charge equilibrium i
s reached in the present colliding system, The charge diffusion coeffi
cient is extracted from the theoretical analysis. The linear relation
between the distribution width and the average interaction time is asc
ribed to the charge diffusion process. The effects of the cross correl
ation between different isotopes on the fluctuation amplitude is also
discussed in the paper.