提出利用Ｆａｂｒｙ－Ｐｅｒｏｔ干涉结构测量压电晶体的特性曲线，即利用光纤Ｆａｂｒｙ－Ｐｅｒｏｔ干涉腔将ＰＺＴ的径向（或长度）的变化转为相位的变化，再通过光电转换进行电信号的处理得到相位所对应的ＰＺＴ陶瓷径向（或长度）的变化，文章给出实测的实验室用ＰＺＴ曲线。实验表明：该方法简单、测量精度高且能实现实时测量。 The characteristic curve of piezo-electric crystal measured by Fabry-Perot interference structure is proposed. That is, the change of the radial (or length) of the PZT is changed to the phase by the fiber Fabry-Perot interference cavity, and then the electrical signal is processed by photoelectric conversion Phase PZT ceramic corresponding to the radial (or length) changes, the article gives the measured PZT curve with the laboratory. Experiments show that the method is simple, high accuracy and real-time measurement.