应用有限元仿真法和灰色预测理论，以结构因有频率的下降率为特征参数，对钢筋混凝土梁的裂缝损伤问题进行了故障诊断和预测分析，得到了一些有益的结果，提出了一种对工程结构进行故障诊断和预测的新方法，实际表明此方法是切实可行的； Using the finite element simulation method and the grey prediction theory, taking the frequency reduction of the structure as the characteristic parameter, the fault diagnosis and prediction analysis of the crack damage problem of the reinforced concrete beam was carried out, and some beneficial results were obtained. The new method of fault diagnosis and prediction of the engineering structure actually shows that this method is feasible;