It is an international hotspot to monitor the working condition of aero-engine using vibration data. Firstly, three familiar analysis methods for vibration data are introduced; secondly, emulation analysis based on vibration data under steady flight condition are made; lastly, qualitative analysis for the extrusive frequence in the emulation are made. Statistical analysis based on the frequency of multi vibration data suggests that there may be some asymmetry failures in the free turbine which is important for the novelty detection of aero-engine vibration.