  For QCD with Wilson fermions at isospin chemical potential we study the
finite phase transition on an $8^3\times4$ lattice at $\kappa=0.15$. We use two
gauge actions: Wilson action and DBW2 action. Both actions give the same
results. The phase diagram is qualitatively similar to the one obtained for QCD
at small baryon chemical potential. We also calculate the number density for
various isospin chemical potentials.
