Through site environment incentive structure dynamic characteristics test for span of(100+150m) hangar roof structure,the vibration frequency and vibration mode of structure were obtained,based on the analysis of measured data by spectral analysis.Using structural analysis software Midas to build roof space model,and the structure dynamic characteristics obtained by using eigenvector method.Obtained results of finite element calculation and dynamic test in the first 3 order basic cycle have the same differe...