Abstract: Aiming at the problems of unsatisfactory modeling effect in the existing road modeling technology and lack of effective auxiliary interactive technical support in large-scale road network modeling, through the analysis of interchange structure, an effective Euler diagram expression and interactive design method of three-dimen¬sional interchange structure is proposed. Firstly, the data source is preprocessed, and the Euler diagram is generated according to the processed effective road information, which is used to express the topological relationship of the road interchange structure; then the hierarchy relationship of the road is calculated by using the Euler diagram and the structural characteristics of the road. And then according to the control point, Euler diagram topology information and road grid, construct a three-dimensional model of the interchange structure. Finally auxiliary information tools are established to realize interactive editing of the road network. The experimental results of selecting multiple types of interchange structure road networks prove that the method has a wider application range in the types of interchange structure types, and has certain advantages in calculating the correct rate and optimizing the interactive editing process.