Abstract: The National Railway Test Center is a strategic support platform for China railway technology innovation. In order to further enhance the technological innovation capability of China Academy of Railway Science Corporation Limited, based on the construction and operation needs of intelligent high-speed railways, this paper constructed an intelligent testing and verification environment with all elements, all businesses, and all scenarios, and built an integrated platform for digital circular railway test base that covered key systems, support platforms, and intelligent applications, selected typical scenarios such as wheel railway relationship laboratories and vehicle positioning to carry out digital twins experiments, implemented the integration and parallel operation of digital circular railway test bases and physical circular railway test bases, which assisted in the construction of intelligent high-speed railways.