Abstract: During the service of the engine, the compressor blades are damaged by foreign objects, resulting in cracks, falling blocks and other defects, this paper uses the failure analysis method based on fracture analysis technology and energy spectrum analysis technology to find out the mechanism and root cause of compressor blade damage, and puts forward the integrated endoscopic detection and eddy current detection in one monitoring strategy. The typical characteristics of blade damage image and damage detection signal are analyzed through inspection test, and the corresponding relationship between eddy current signal display of defect and actual size is found out, which provides a reference for accurate and reliable quantitative judgment.