  The charge and transition form factors of pion ($F_\pi$, $F_{\pi\gamma}$, and
$F_{\pi\gamma^*}$) are studied with the light-front quark model. We find that
our results for $F_\pi$ and $F_{\pi\gamma}$ agree very well with experimental
data. Furthermore, the decay constants of $\eta$ and $\eta'$ are evaluated. We
also calculate $F_{\eta\gamma}$ and $F_{\eta'\gamma}$ and compare with the
experimental data.
