Abstract
Supersymmetry is studied in the framework of thermo field dynamics. We show that supersymmetry is spontaneously broken at finite temperature and that, when supersymmetry at zero temperature is not broken, the spontaneous breakdown of supersymmetry at finite temperature occurs without any Goldstone fermion. The role of the Goldstone fermion is played by a zero energy mode (called a thermal superpair). Its creation is equivalent to change of statistics of any thermally excited particle.
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