  We calculate the static quark and anti-quark potential both in quenched and
two-flavor dynamical quark lattice QCD using DBW2 gauge and domain-wall quark
actions. Lattice spacings from Sommer scale are determined. We find (i) mixing
of excited states is different in between quenched and dynamical, (ii) lattice
spacing $a_{r_0}\sim a_{m_{\rho}}$ in dynamical and (iii) coefficient of
Coulomb term being $\alpha_{N_f=0}<\alpha_{N_f=2}$ at $a^{-1}\sim$ 2 GeV.
