Framework is the basic structure type, which in many engineering sructures are extensively used. As the impact of earthquake andwind load, the internal structure of materials will change in the period of structural service and resulte in a variety of damage. These damage threatening people’s life and property all the time. Therefore, the research of damage identification of framework structure not only has important theoretical significance, but also has a useful reference value for engineering applications. According to structural dynamics theory, the structural damage will cause the change of structural modal parameters, such as natural frequencies, normal vibration mode, stiffness and damping.