Abstract: The inducer ruptured during the burst test of a high pressure turbine rotor of engine. In order to find out the failure cause, macro and micro observation, metallographic examination, chemical composition analysis, and vibration data analysis were carried out. The results show that the fracture mode of the inducer is overload fracture. Based on residual deformation amount analysis and finite element analysis, it is assumed that the moment caused by eccentric centrifugal force made the inducer deflect and the lock sheets distort. The plastic strain of the lock sheets exceeded the limit, leading to their fracture. Then the inducer got rid of the constraint of the turbine disk constraint and broke.