An algorithm of fault diagnosis based on T-S fuzzy model was proposed.In the algorithm

fuzzy rules were obtained from sample book data.The structure of fuzzy system is adaptively optimized when the parameters of fuzzy system are optimized.A method to determine fault diagnosis threshold was introduced.According to the airborne recorded aeroengine steady state data obtained during fixed time check

the algorithm was used to diagnose the turbofan engine fault.The results show that the algorithm can exactly diagnose some turbofan engine fault.This shows the feasibility of applying this algorithm to aeroengine fault diagnosis.