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In the flight test, as a direct power source of the aircraft, the condition monitoring and fault alarming technology of the aero-engine is an important method to ensure the safety of the flight test. However, the traditional alarm technology has the problem of false alarm and low accuracy. the traditional frequency domain alarm method can`t accommodate the change of working conditions, and the problem that the local characteristics and global characteristics can`t be taken into account. In this paper, The improved envelope alarm method and frequency band alarm method are studied and the two are applied to the homogenized spectrum. The effectiveness of the method is validated by using aero-engine fault data. The results show that this method can effectively divide the high-energy and low-energy regions of the spectrum under different operating conditions of the engine, taking into account the local and global characteristics of the vibration signal, and improved Failure alarm automation level and accuracy.