针对PZT95／5陶瓷材料FRL-FRH相变时的热释电特性，建立了相变过程中自发极化随温度变化的定量计算表达式，表达式中的函数级数依据Leibniz交错级数定理，可按照实际要求的精确程度进行级数求和，故利用计算机拟合了自发极化随温度的变化曲线．拟合曲线与实验测量的结果相一致，证明了理论计算公式能定量地描述相变过程中自发极化随温度变化的规律，有利于对铁电材料的相变性质进行深入的研究．“,”In view of the pyroelectric performance of PZT95/5 ceramics during the FRL-FRH transition, an analytic formula of spontaneous polarization varying with the temperature during the phase transition was established. According to Leibniz theorem of stagger progression, a sum can be extracted from the progression function in the formula in accordance with actually required accuracy. The curves of spontaneous polarization vs temperature for PZT95/5 ceramics during the FRL-FRH transition were simulated by means of the computer. The simulated curves fitted well with the experimentally measured curves. The result testified that the variation of spontaneous polarization during the phase transition can be described quantitatively and gives the theoretical significance to investigate deeply the phase transition performance of ferroelectric materials.