In order to evaluate the service life of aviation hydraulic pipe,fatigue crack was the main mode of failure with high severity of hydraulic pipe by analyzing fault data.By collecting the test data of the vibration stress of the hydraulic pipe,the vibration stress value and the occurrence law of the fatigue crack were analyzed,and it was concluded that the longterm high vibration stress environment was the important reason of the pipe fatigue crack.The vibration stress environment of the aircraft hydraulic pipe after one cycle was evaluated.According to the characteristics of the fatigue resistance of the hydraulic pipe,the pulse and bending fatigue tests were carried out with the highstress zone hydraulic pipe with one cycle to evaluate the fatigue resistance of the hydraulic pipe.It provides basis for determining the life of the hydraulic pipe.