  The running coupling and the Kugo-Ojima parameter of unquenched lattice
Landau gauge are simulated and compared with the continuum theory. Presence of
infrared fixed point of $\alpha_0\sim 2-2.5$ irrespective of the fermion
actions (Wilson fermions and Kogut-Susskind(KS) fermions) in the continuum and
in the chiral limit is suggested. Although there exists dependence on the
polarization due to asymmetry of the lattice (time axis is longer than spacial
axes), the Kugo-Ojima parameter $c$ is consistent with 1. Presence of
$1+c_1/q^2$ correction factor in the running coupling depends on the lattice
size and the sea quark mass. In the large lattice size and small sea quark
mass, $c_1\sim 2.8$GeV is confirmed. The MILC configuration of $a=0.09$fm
suggests also presence of dimension 4 condensates with sign opposite to the
dimension 2 condensates. The gluon propagator, the ghost propagator and the
running coupling are compared with recent pQCD results including anomalous
dimension of fields up to the 4-loop level.
