The association and fusion of multidimensional information is the key to establishing the whole digital twin system. In view of the fact that digital twins lack of data interaction and linkage between physical domain and information domain in the whole life cycle, which cannot meet the demand of rapid driving of multi-dimensional information of digital twin products. In order to support product design, this paper studies the modeling framework of digital twins first, and proposes a product design modeling framework including physical layer, model layer, information layer and application layer. Then, based on the meta-modeling method, the digital twin design meta-model is defined, which includes business metadata, data model and associated metamodel. Meanwhile, a unified description model for the whole life cycle of digital twins is constructed, which includes the relational sets of metadata models such as process, resources, knowledge and products. The data interaction between physical entities and digital twins is completed, which solves the problems of data interaction between physical domains and information domains, data exchange and information sharing among heterogeneous models, and realizes the association and fusion of multi-dimensional information in the whole life cycle of digital twins.