对属于铁电体的热释电体从德文希尔热力学理论模型出发，导出了热释电系数和自发极化强度的关系Ｐ／χ＝ＰＳ／Ｃ，测量了ＬＵＴＧＳ晶体的ｐ／χ和ＰＳ／Ｃ分别随温度的变化曲线。发现两曲线有较好的一致性，但仍有差异。结合德文希尔热力学理论模型分析了其原因。指出了该关系对铁电体材料热释电性提高的指导意义。 Based on Derwent Hill thermodynamic theory model, the pyrolytic body belonging to ferroelectrics is derived from the relationship between pyroelectric coefficient and spontaneous polarization P / χ = PS / C. The p / χ and PS / C, respectively, with the temperature curve. Found that the two curves are better consistency, but there are still differences. The reason is analyzed with the theory of Devonshire thermodynamics. It is pointed out that the relationship has the guiding significance for improving the pyroelectricity of ferroelectric materials.