Because at present so many equip category and new technique, a single kind method of simplicity fault diagnosis can not attain the purpose of the equipment diagnosis, this article firstly analyze and induced the basic principle, characteristics, design of diagnosing the method and applies realm of neural network and expert system, then build up an intelligent fault diagnosis system framework for Equipment based on the combination of the diagnosis method of neural network and expert system, finally provide a new way of thought for the intelligence of material.