Abstract: Complex multi?mode signals can be decomposed into single mode components using time?frequency decomposition tech? nology. This allows for the use of a simple and reliable single mode identification method to identify the complex modal signals of mechanical structure. Empirical wavelet transform (EWT) method can effectively decompose the modes, and some revised meth? ods even can overcome the strong noise. However, when reconstructing the modes, the reconstructed mode could be distorted due to overlapping filters and closely spaced components. Focusing on the problem of mode decomposition and reconstruction, this pa? per analyzes the problem of distorted reconstructed mode of EWT method, proposes a revised method based on the Iterative Trun? cated Singular Value Decomposition (ITSVD) method, and applies this new method to both the synthesis signal and the experimen? tal signal from the vibration response of a mechanical structure model with a joint surface. The results suggest that the proposed ITSVD?EWT method is more effective in mode decompose and reconstruction.