Abstract: In order to make the information of railway passenger transport extended service products (hereinafter referred to as extended service products) reach users better and faster, this paper constructed a knowledge graph of extended service products based on knowledge graph technology. On the basis of analyzing the characteristics of extended service products, the paper introduced the construction method of its knowledge graph, combined with the actual demand, illustrated the application effect of this knowledge map with examples from the perspectives of product search optimization and recommendation optimization. The research shows that the knowledge graph can help users get the information of extended service products faster and more accurately, and plays an important role in improving the exposure rate of extended service products and user conversion rate.