液晶的转动粘质度是液晶用于显示和通讯的重要物理参量.本文设计开发了基于微机的液晶参数测试光学系统,在该系统上研究了液晶的转动粘质系数的测试原理与方法:通过测试液晶盒在偏置电压下相位驰预时间,推导出转动粘质系数的值.测试Merck公司的E7液晶的转动粘质系数随温度变化的曲线,进行了理论拟合,测试结果与理论符合得很好.通过分析另一系统对液晶介质常数随温度变化的曲线的测试结果,验证了该测试原理与方法的正确性.该测试方法具有简单、自动化的特点. The rotational viscidity of liquid crystal is an important physical parameter of liquid crystal for display and communication.This paper designs and develops a microcomputer-based liquid crystal parametric test optical system, on which the principle and method of testing the rotational viscous coefficient of liquid crystal are studied: The phase of liquid crystal cell under bias voltage was pre-determined, and the value of rotational viscous coefficient was deduced.The theoretical fitting of the rotational viscosity coefficient of Merck’s E7 liquid crystal with temperature was carried out, It is very good.Through analyzing the test results of the curve of the dielectric constant of the liquid crystal with temperature in another system, the correctness of the test principle and method is verified. The test method is simple and automatic.