  A general expression of the axial-vector current is presented, in which both
the effects of the chiral symmetry breaking and the spontaneous chiral symmetry
breaking are included. A new resonance formula of the axial-vector meson is
derived and in the limit of $q^{2}\rightarrow 0$ this formula doesn't go back
to the ``chiral limit``. The studies show that the dominance of the
axial-vector meson is associated with the satisfaction of PCAC. The dominance
of pion exchange is companied by the strong anomaly of PCAC.
