  Aspects of the phase change of the two-level pairing model are investigated
in the semi-classical treatment by using the variational approch with the
mixed-mode coherent state. In the classical limit, $hbar \to 0$, the sharp
phase transition appears and the two phases exist in the region where the force
strength is larger than a certain critical value. However, it is shown that, in
the semi-classical treatment, the above-mentioned behavior of the phase change
disappears in the analytical and the numerical treatments. As a result, new
understanding about aspects of the phase change in this model is given.
