Abstract: The paper, based on Hilbert-Huang transform (HHT) method, analyzes the dynamic environmental data recorded during the fairing separation process of fairing. The Hilbert spectrum in the time and frequency domain is acquired from a group of self-adapted primary functions. Meanwhile, the main frequency and the corresponding time range of the diachronic vibration signals are accurately identified. The example of using HHT to deal with the flight data can serve as a reference for the establishment of ground spacecraft mechanical test conditions and the examination of the interface conditions for the launch vehicle.