Abstract: This paper gives the way of using fuzzy theory to establish ANN(artificial neural network)for single-fault and multi-faults diagnosis based on one set of symptoms and multifautt diagnosis based on more sets of symptoms,respectively.In addition,each ANN established here is a typical kind of fuzzy neural networks for fault diagnosis.The paper sets forth how to establish an available fault diagnosis system based on ANN while in practice.therefore,it may have some extent reference values and may be instructive in fault diagnosis field to construct fault diagosis system based on ANN.

Key words: artificial neural network(ANN)； fault diagnosis； fuzzy theory； fuzzy neural network；