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On the structural response signal continuously Complex Morlet wavelet transform, the wavelet coefficients extracted wavelet modulus maxima ridge line, identify the structure of the instan eous frequency to reduce the effects of noise, using singular value decomposition (SVD) method for noise reduction, the establishment of A complex wavelet transform based on continuous time-varying systems instan eous frequency identification method. With a time-varying stiffness spring-mass system numerical example effectiveness of the method, followed by the design of a time-varying cable structural testing, respectively Suoshi Jia linear and sinusoidal variation of tension, while the impulse response of the test structure, the use of the proposed method successfully identified the cable instantaneous frequency. Numerical and experimental results show that the proposed method can effectively identify the structure of time-varying instantaneous frequency, and the identification method has some n