  The meson cloud distributions in $r$-space are extracted from the nucleon
electromagnetic and axial form factors which are derived in the perturbative
chiral quark model. The theoretical results indicate that the electric charge
and axial charge distributions of the three-quark core are the same, the
magnetic charge distributions of the meson cloud and three-quark core are more
or less in the same region and peak at distances of around 2 $\rm GeV^{-1}$,
but the axial charge meson cloud distributes mainly inside the three-quark
core.
