Precise hysteresis loops of ferroelectric crystal have been deduced from the switching current caused by application of triangular field. The contributions of conduction and capacity of the crystal were subtracted from the current, and the pure ferroelectric polarization was obtained from the integration of remaining current. All the procedure was performed by the use of personal computer. Not only the parameters of hysteresis loop (spontaneous polarization P_s, coercive field E_c, bias field E_b) but also the dielectric constant ε_r were automatically obtained in a wide frequency range. The temperature dependence of P_s of triglycine sulfate in a wide temperature range was investigated.
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