铁电体是我们这个世界中众多材料中的一种,它在自然的情况下就有电性,是一种非常特殊的材料。铁电材料具有良好的铁电性、压电性、热释电性以及非线性光学等特性，是当前国际高新技术材料中非常活跃的研究领域之一。铁电材料及其应用研究已成为凝聚态物理、固体电子学领域最热门的研究课题之一。本文介绍铁电体相变的一些初级理论。

Ferroelectric material which has a good ferroelectric, piezoelectric and pyroelectric and nonlinear optical properties, is the international high-tech materials in a very active research field, and its research focus towards the development of practical use. Ferroelectric materials and their application has become the condensed matter physics, solid state electronics area of research the most popular one. This article describes a primary theory of phase transition of ferroelectrics。