Shandong Hi-Speed is primarily involved in the investment and operation of transportation infrastructure in China. They operate and maintain toll roads, bridges, tunnels, and other infrastructure facilities. The company also engages in equity investment in related industries, finance, and environmental protection. Their main sources of revenue include toll collection, railway transportation, sales of goods, and project construction. Additionally, they provide smart transportation services, develop supporting land, logistics, and related services, and manage financial assets.