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The ferroelectric crystal structure of SbSBr is composed of [Sb(S, Br)] 1 chains parallel to the [001] axis. In paraelectric phase, the crystal structure is disordered. The theoretical investigation of dependence of potential energy V P (z) of Sb atoms on amplitudes of B 1u vibration symmetry coordinates along c(z)-axis have showed that each atom is shifted from the xy mirror plane by Dz up or down along [001]. The theoretical investigation of the average potential energy V P ðzÞ of all Sb atoms in unit cell revealed that in paraelectric phase in region of phase transition V P ðzÞ has double-well shape. This strong anharmonicity of V P ðzÞ is created by interaction between phonons.