The IFC （ Industry Foundation Classes） standard for engineering information exchange is insufficient for defining and expressing structural dynamic information. In order to solve this problem,first,the existing IFC-based structural information model is analyzed,and some missing details of the model that support the structural dynamic analysis are evaluated. Next,the information requirements of the structural finite element analysis software SATWE are analyzed in terms of geometry information,load information,material information and analysis result information. Then,the information requirements are compared with the entities corresponding to the IFC standard,with which some extension suggestions about IFC-based structural analysis model are proposed. Moreover,the dynamic load information such as the earthquake action is defined according to the IFC-formatted EXPRESS representation criterion,and the contents of the structural dynamic analysis information are described. Finally,the basic framework of the structural dynamic analysis information is constructed in EXPRESS-G graph,which extends the structural finite element analysis information and provides some references for the extension of IFC-based structural information model.