Based on the regularity that 'generalized force vectors' appear without exception in the combination of the inverse iteration method with the conjugate gradient method, this paper makes finite element/strip meshes rearranged in dynamic analysis of large-scale structures, and then they are assembled in batches into the vectors with groups. It thus avoid the assemblage process to obtain the structure matrices K and M and also provide a concide a concise and effective approach for microcomputers to save lot of internal storage.