  The structure of chiral symmetry restorations at finite temperature is
thoroughly investigated in the supersymmetric Nambu-Jona-Lasinio model with a
soft supersymmetry breaking term. It is found that the broken chiral symmetry
at vanishing temperature is restored at sufficiently high temperature in two
patterns, i. e., the first order and second order phase transition depending on
the choice of the coupling constant $G$ and the supersymmetry breaking
parameter $\Delta$. The critical curves expressing the phase boundaries in the
$G-\Delta$ plane are completely determined and the dynamically generated
fermion mass is calculated as a function of temperature.
