Abstract: According to the repeatability of the composite cell structure, a dynamic modeling method for stitched sandwich panel based on the repetitive substructure was proposed. The primary substructure and the residual structure were constructed by using the precise finite element model of the composite unit cell. The repetitive substructure was obtained by mapping the spatial position relation. All the substructures were assembled on the residual structure to realize the dynamic modeling and analysis of the repetitive substructure of the composite. Taking the stitched sandwich panel as an example, the repetitive substructure modeling and dynamic characteristic analysis were carried out, and compared with the precise solid finite element model, the accuracy and efficiency of the method were verified. The influence of the primary substructure external nodes selection, the residual structure location distribution and the primary substructure size selection on the repetitive substructure modeling and analysis results was analyzed. The following conclusions are drawn:For the structure of stitched sandwich panel with repetitive unit cell, the dynamic structure modeling method of the repetitive substructure is used, the selection of the residual structure is not unique. And the more of the number of external nodes of the primary substructure, the less of the repeated mapping process, the higher of the calculation accuracy and computational efficiency. The repetitive substructure modeling method of the composite structure can improve the dynamic analysis efficiency of the composite structure when the external node selection ratio of the initial substructure is 50%.