The design architecture and key technologies of the PC virtual operation platform for a protection and control device are desiged in this paper.The device is classified into management process,several real-time components and non-real-time components.The management process reads the configuration files,loads the real-time and non-real-time components libraries of each processor,and completes the initial interaction via virtual CAN bus and FIFO communication.The management process initiates the real-time thread,sets the relationship as per the task cycle,and executes the real-time tasks serially;the management process initiates several non-real-time threads,calls up non-real-time component cycle tasks,and realizes concurrent communication with several debugging clients.Data interaction between components is realized via virtual data bus and shared memory.The platform-based development method supports the simulated testing of the complete set function.Device configuration and program may be operated in the physical device and the virtual device,thus improving the developm ent efficiency.