讨论了机械故障诊断中采用多参数诊断法的必要性，阐述了神经网络理论用于多参数诊断的理论依据，归纳了神经网络多参数诊断法的实施步骤，并以滚动轴承故障诊断为例，对该方法进行了实验验证，证明了该方法的实用性． The necessity of adopting multi-parameter diagnosis method in mechanical fault diagnosis is discussed. The theoretical basis of neural network theory for multi-parameter diagnosis is expounded, and the implementation steps of multi-parameter diagnosis method of neural network are summarized. Taking rolling bearing fault diagnosis as an example, The method has been verified by experiments, which proves the practicability of this method.