In order to dispose some faults of screw pump wells widely applied in the oil field exploitation and improve the veracity of fault diagnosis and the capablility of multi-fault diagnosis,an intelligent integrated fault diagnosis expert system based on the fuzzy neural network was established,and the construction of the system was given.The construction and function of fuzzy neural network were introduced,and the structure and performance of the integrated repository were analyzed,then the fault diagnosis processing of the system was designed.The running application of the system on the practical field screw pump achieves the expected diagnosis effect.