The paper studies complex electric equipment fault diagnosis based on the theory and method of fault diagnosis by applying the theory of artificial intelligent ,database and fuzzy theory,and brings forward a way of developing a fault diagnosis ex-pert system based on database.It also gives out the frame of the system.In the imple-ment of the system,we use membership function to mirror faults' fuzzy and fuzzy con-cern,relational database to describe knowledge and rules,fuzzy renew algorithm to per-form ...