Abstract: Baihetan - Jiangsu UHVDC transmission project is the first actual project in the world to adopt LCC+MMC cascade structure at the receiving end, and the receiving end is connected to four AC feed points in layers. In this paper, according to the design data and actual parameters of Baijiang project, a real-time simulation platform of digital/analog hybrid of Baijiang Project was constructed, which included MMC digital valve control system, FPGA valve body simulation model of small step length, and DC actual control and protection device, and realized accurate multi-time scale simulation of nanosecond - microsecond - millisecond level of Baijiang project. The accuracy of the simulation platform is verified by a large number of functional tests and consistency comparison tests with the actual engineering recording. The advantages of the special structure and control mode of Baijiang project in improving the resistance ability of the receiving end AC fault are simulated and analyzed, which can avoid commutation failure or reduce the power disturbance caused by commutation failure, and improve the AC overvoltage of the receiving end caused by the fault. This platform will continue to be applied in the research of digital - analog hybrid simulation of large power grid with multiple DC feeds into East China.