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With the large-scale use of rail vehicles, the safety of trains, especially the window structure, has become an increasingly concerned problem. The inspection of window adhesive quality is of great significance for the normal operation of rail vehicles; The combination of finite element simulation and ultrasonic testing was adopted. By establishing the simulation model of window bonding structure, the propagation process of ultrasonic in bonding structure and the variation law between ultrasonic and defects with different debonding length were analyzed in detail, and the relationship model between defect echo amplitude and debonding length was established; By building an ultrasonic testing experimental system, the simulated defects with different sizes at 21mm were tested. After analyzing the test data, the relationship model between defect echo amplitude and debonding length was drawn. The results showed that the results of the relationship model between actual detection and simulated defect echo amplitude and debonding length are consistent, The correctness and reliability of the simulation model and the relationship model between defect amplitude and debonding length were verified, which provides a reference model and theoretical basis for the quantitative analysis of debonding detection of window bonding structure.