Abstract: In order to better enhance the stability, maintainability, and scalability of smart city transport digital twin application services, this paper designed a set of digital twin application systems for urban transport based on cloud rendering technology. It elaborated on the architecture and functions of the system, and utilized key technologies such as real-time video streaming services and cloud computing resource intelligent scheduling strategies to implement unified deployment of digital twin application services, stable rendering under multi-user concurrency, and efficient operation and maintenance management of multiple application services. Practical application has shown that the system can operate stably on large-scale transport hub projects and achieve good expected results.