  In this paper, we apply the reduced density trajectory, phi-mapping
topological current theory and Ginzberg-Landau model to study the current of
the coherent state. We give the new expression of the current of the coherent
state. Based on this expression, the symmetry of the coherence is studied. We
find that the current of the coherent state corresponds to the supercurrent of
two-condensate system. The partial wave functions of the coherence carry new
charges and their interaction is mediated by new U(1) gauge potential.
