  To study continuum limit of lattice QCD with many light quark flavors, we
investigate the zero temperature phase structures of multi-flavor QCD.
Currently a series of exploratory simulations are being performed with the
number of quark flavors, $N_f $= 6, 8, and 10 on a set of lattice volumes for
various quark masses. Here, we report on the current status of our simulation
on a $8^4$ lattice.
