In order to solve the problem of vibration characteristics changing due to fatigue cracks generated during the operation of 〖JP2〗the aero-engine turbine impeller,it was studied based on the finite element mode analysis theory.The finite element model of the integral impeller with different crack lengths and crack distribution locations was established to analyze the natural frequency changes under dynamic and static conditions respectively.The influence of the crack on the frequency steering of the integral impeller was analyzed.Finally,by analyzing the response of the cracked blade under excitation,the variation of its response amplitude and vibration direction was obtained.The results show that the crack reduces the natural frequency of the integral impeller and has a great effect on the low order frequency.The crack can affect the vibration mode of the integral impeller,and the vibration localization phenomenon appears.The appearance of cracks affects the frequency steering of the integral impeller.With the increase of crack length,the response peak value of the cracked blade in the integral impeller increases gradually,and the cracked blade has a wide range of reverse vibration phenomenon.