Abstract: The time-frequency analysis method is widely used in various fields, especially in the field of engineering, and it is applied to the deformation of structures and components and internal damage detection.As an emerging nonlinear, HHT non-stationary time-frequency analysis technology has broad prospects in the field of detection and exploration.In this paper, the EMD, EEMD and CEEMD algorithms are analyzed.The Fourier transform and Hilbert-Huang transform of the synthesized signal are used to obtain the spectrum of the signal, Hilbert's yellow spectrum and marginal spectrum.Through comparative analysis, the advantages and disadvantages of the three methods are summarized.The results show that the EMD, EEMD and CEEMD methods are effective tools for nonlinear non-stationary signal analysis.