传感器故障诊断技术的研究对提高系统可靠性具有重要的意义，随着工程应用的需要，基于模型的诊断技术已经成为该领域极为活跃的研究方向．本文给出基于模型的传感器故障诊断技术的一般原理，并基于线性模型给出一类传感器故障诊断方法，可对多传感器故障进行精确定位，最后给出一个二阶系统的算例、本方法具有极大的工程实用价值． The research of sensor fault diagnosis technology is of great significance to improve the system reliability. With the needs of engineering application, the model-based diagnosis technology has become an extremely active research direction in this field. In this paper, the general principle of model-based sensor fault diagnosis technology is given. Based on the linear model, a class of sensor fault diagnosis method is given, which can locate the fault of multi-sensor accurately. Finally, an example of the second-order system is given. Great project practical value.