  We have investigated the axial charges of the ground octet baryons within the
extended chiral constituent quark model, where all the possible compact
five-quark Fock components $qqq(q\bar{q}) (q=u, d, s)$ in the baryons are
considered. The transition couplings between the three- and five-quark
components in the baryons are assumed to be via the $^{3}P_{0}$ mechanism,
which could reproduce the sea asymmetry in proton very well. The numerical
results for the flavor-dependent axial charges of the octet baryons are
comparable to those predicted by other theoretical approaches. It is shown that
the singlet axial charges of the octet baryons, which should indicate total
baryons spin arising from the spin of the quarks, fall in the range $0.45-0.75$
in present model. This is in consistent with the predictions by lattice QCD and
chiral perturbation theory. It's also very interesting that the light quarks
spin $\Delta u$ and $\Delta d$ in the $\Lambda$ baryon are of small but
negative values, which exactly vanish in the traditional three-quark model.
