Abstract: The fracture characteristics and failure modes of the first- and second-stage blades in a high-pressure compressor were confirmed by comprehensive analysis on the material and fracture surface of the fractured blades.The results show that the fracture of the blades has nothing to do with the material.The first-stage blades of the high-pressure compressor first fractured,and their failure mode is fatigue fracture.The failure mode of all the second-stage blades is fatigue fracture by larger stress,so they are victims.The fracture of the first-stage blades is mainly related to larger resonance stress,which belongs to structural design problem.Further analysis shows that the thickness of the first-stage blades is excessive,making the first-order bending resonance speed caused by K=3 closer to the speed range of slow car.There are obvious transverse machining marks near the crack source of the fatigue fracture blades,which reduced the fatigue performance.The obvious machining damage on the blade surface promoted the fracture of the first-stage blades.