In order to solve the problems of completeness and consistency of maintenance information in the process of product lifecycle, the architecture and theory of Multi-body structure maintenance information modeling for Multi-layer representation were proposed. The implementation of Basic Body，Retrieval Body and Control Body was given. This model applies attribute mechanism to constitute the mapping of geometry topology information and non-geometry information. For example, the maintenance information of model, and the structure of multi-layer representation for assembly model information are constructed by framework of tree structure. It can satisfy the requirements of representation completeness and dynamic following in virtual maintenance. Its feasibility is verified by research results.