Abstract: With the promotion and application of Object Controller (OC) system in the field of rail transit, the problems of high hardware investment, long research and development cycles, and complex environmental construction are gradually emerging. Based on the architecture and characteristics of the OC system, and based on modular design, this paper studied and developed the OC digital twin system, and used SkyEye to develop and construct the OC digital twin system, simulated the software and hardware functions of the OC system, and implemented virtualization of the OC system. The OC digital twin system has been put into trial operation in the renovation project of Shanghai Metro Lines 3 and 4, and the operation effect is good. It can effectively alleviate the resource conflict problem caused by development, debugging and testing work, and save hardware resources and time costs.