  The chiral perturbation theory (ChPT) of pions is extended to include vector
mesons as well as pertinent degrees of freedom. By counting the typical
momentum scale of vector mesons as order of $Q$ and vector meson masses as of
the order of $\Lambda_\chi$, a consistent theory could be obtained. The
explicit renormalization procedure of the theory is presented for the form
factors of the pion up to one-loop accuracy. The resulting theory prediction
for the form factors is in good agreement with the experimental data for a wide
range of momentum transfers. The vector-meson dominance mechanism is also
discussed in the systematic framework of ChPT.
