The identification of adhesion state of pipeline with anti-corrosion coating is a hot research direction of pipeline state pre diagnosis. The curved pipe is divided into several closely connected micro body element plate structures, the propagation model of nonlinear ultrasonic guided wave in micro body element structure is established, the dispersion characteristics and energy transfer characteristics of guided wave in micro body element and between adjacent micro body elements are analyzed, and the echo signal is analyzed by spwvd time-frequency analysis and wavelet packet decomposition algorithm, In order to extract the characteristic quantity which can represent the different bonding state of pipeline. In this paper, the PMMA aluminum double-layer bonding structure with similar performance to the pipeline with anti-corrosion coating is taken as the experimental object. The ultrasonic echo signals of the intact bonding state, the weak bonding state based on the density change and the partial debonding state based on the thickness change are collected respectively, and the corresponding relationship between the material parameters and the bonding state is analyzed, The recognition rate is 92. 31% .