Abstract: Limited by the development of high-power turn-off devices, the current source converter (CSC) for high voltage direct current (HVDC) has not made any substantial progress. In this paper, the CSC topology based on several cascaded converters are introduced firstly, and then, a 250V/750kW HVDC simulation system is established for extracting parameters of revere blocking integrated gate commutation thyristor (RB-IGCT). After that, the key design methods and technological process for low conduction voltage drop, loss and high du/dt and di/dt are carried out. Finally, a 4500V/3000A RB-IGCT is developed, and core parameters are verified via experiments. The research shows that the developed RB-IGCT can meet the requirements of the system and is feasible for CSC.