  The density of states method is applied for lattice QCD at a finite isospin
density. The advantage of this method is that one can easily obtain results for
various values of parameters (quark mass, coupling constant and the number of
flavors). We compare results for the chiral condensate and the quark number
density with those from the R-algorithm and find that they are in good
agreement. By calculating the chiral condensate we obtain information on the
phase structure for various quark flavors and isospin chemical potentials. We
also show results for the chiral condensate at two different quark masses and
at two different isospin densities which are not easily obtainable in the
conventional Monte Carlo method.
