Abstract: How to transform symbol scheme obtained during the conceptual design to intuitionistic graph scheme automatically is a basic problem in creative design of mechanical system. In this paper structure of the mechanism and relationship among parts are recognized by analyzing the adjacency matrix. 2D geometric dimensions can be confirmed through the dimension matrix element of symbol scheme. An object-oriented program is developed based on the 3D parametric modeling software, and 3D part model can be realized automatically through the program. The virtual assembly of 3D parts can be carried out based on the spatial position of components and predefined assembly information contained in the background analysis program. The processes mentioned above are executed in the object-oriented environment. After the symbol scheme of conceptual design is input, the 3D scheme matching the symbol can be realized automatically by the system.