  We explore the link between the chiral symmetry of QCD and the numerical
results of the light-front quark model, analyzing both the two-point and
three-point functions of the pion. Including the axial-vector coupling as well
as the pseudoscalar coupling in the light-front quark model, we discuss the
implication of the chiral anomaly in describing the pion decay constant, the
pion-photon transition form factor and the electromagnetic form factor of the
pion. In constraining the model parameters, we find that the chiral anomaly
plays a critical role and the analysis of $F_{\pi\gamma}(Q^2)$ in timelike
region is important. Our results indicate that the constituent quark picture is
effective for the low and high $Q^2$ ranges implementing the quark mass
evolution effect as $Q^2$ grows.
