本文研究了裂纹转子的振动响应。文章首先通过应力强度因子积分得到含裂纹轴单元的刚度矩阵；建立了裂纹转子的运动微分方程。进而研究了裂纹转子的振动响应，得出了裂纹转子的振动响应随裂纹位置和深度的变化关系。为工程上早期诊断微小裂纹提供了理论根据。 In this paper, the vibration response of cracked rotor is studied. Firstly, the stiffness matrix with cracked axial elements is obtained through integral of stress intensity factor. The motion differential equation of cracked rotor is established. Then the vibration response of the cracked rotor is studied, and the relationship between the cracked rotor vibration response and the position and depth of the cracked rotor is obtained. It provides a theoretical basis for early diagnosis of micro-cracks in engineering.