Abstract: For expediently studying the terminal voltage of HI-13 tandem accelerator, a terminal voltage model of HI-13 tandem accelerator was proposed, and the validity of the model was verified. Then a simulation platform of terminal voltage hardware was developed based on embedded system. The simulation platform can accept the control input as accelerator working. The real working state was calculated by means of simulation of terminal voltage model in the built-in system, and the same output was produced with the actual equipment. By establishing simulation platform of terminal voltage hardware, it can provide the research object for the development of the control system, and improve the efficiency of developing the control system. This study result will afford the basis on follow-up research work to the HI-13 tandem accelerator.