Abstract: The leading edge heating component of helicopter blade is the multi-layer bonding structure with complex curved surface, and its bonding quality affects the safety of blade and even the whole machine. At present, there are some problems in ultrasonic detection of debonding defects of heating components, such as difficulty in extracting defect signal and low efficiency of single probe detection. Aiming at the existing problems, the propagation law of sound wave in multi-layer medium was studied, and the defect identification method of stainless steel/rubber bonding layer in the structure was clarified. According to the complex shape and scanning needs of heating components, an array probe was made, and the array imaging detection was carried out on the sample and actual heating components. The results show that the debonding defect of stainless steel / rubber layer of heating module can be detected by array imaging method, and the defect morphology was accurate and clear.