分析了某发动机二级涡轮叶片的振动特性、振型应力，共振特性；并结合内外场大量的频率统计数据进行了共振相干分析，分析了叶片故障原因，并提出采用限频、调频等排故措施。 The vibration characteristic, mode stress and resonance characteristic of the second-stage turbine blade of an engine were analyzed. The resonance coherence analysis was conducted based on a large number of frequency statistics of the internal and external field. The causes of the blade failure were analyzed. Measures.