There are logic structure and value law in product form design. In order to explore the content and the complex mechanism of communication in the product form design, this paper studies the interaction between design elements and the importance of nodes in the integration process of product form design elements from the perspective of complex networks, so as to assist designers to design scientifically and efficiently. First, based on the complex network theory, the collaborative network model of product form design elements is constructed with product form design elements as nodes. Second, on the basis of the model, the evaluation indexes of node importance of product form design elements are constructed, and the triangular intuitionistic fuzzy numbers evaluation method is introduced to evaluate the importance of network nodes. Then the PageRank algorithm is used to modify the evaluation results. Finally, the front face of Audi is taken as an example to illustrate the whole research process.