It is shown that the continuum limit of the spin 1/2 Heisenberg XYZ model is far from sufficient for the site number of 16. Therefore, the energy spectrum of the XYZ model obtained by Kolanovic et al. has nothing to do with the massive Thirring model, but it shows only the spectrum of the finite size effects.The spin 1/2 Heisenberg model is a rich theory, which contains a variety of field theories in the continuum limit. In particular, the Heisenberg XYZ model is proved to be equivalent to the massive Thirring model in the continuum limit.Recently, Kolanovic, Pallua and Prester [1] solved the Heisenberg XYZ model numerically to study the bound state problem in the massive Thirring model. In