  We investigate the distribution of low-lying eigenmodes of hermitian
Wilson-Dirac operator, $H_W$, with the gauge action whose form is designed to
avoid topology change, as well as with the standard plaquette action. On the
quenched lattices, the former gauge action exhibits less density of low-lying
eigenmodes of $H_W$ compared to the latter at the same lattice spacing. We also
show preliminary results for the dynamical simulation with two flavors of
overlap fermions.
