Dielectric dispersion of the ferroelectric liquid crystal (CS-1022) around the SC*-SAtransition and temperature dependence of the spontaneous polarization were measured by varying the cell thickness. Behaviour of the dielectric constant is well described by a formula including the contribution of the soft mode, the Goldstone mode and the ionic conduction. Temperature dependence of the spontaneous polarization is expressed by a formulaPo(TC-T)α.