Abstract: Compared with power electronics systems in AC grid, the power electronics systems in DC grid have a lot of different characteristics, which provide opportunities for the application of integrated gate commutated thyristor（IGCT）. This paper timely summarized the development trend of key power electronics systems in DC grid, and the application of IGCT in DC grid is prospected. Firstly, the application characteristics of IGCT and the key power electronics systems, included high-voltage high-power voltage source converter, medium or high-voltage high-power DC transformer and highvoltage high-power dc breaker, in DC grid were introduced. On this basis, by combining nature features of IGCT and voltage source converter, DC transformer and DC breaker, the application opportunities, basic scheme and technology advantages of IGCT in these systems were discussed comprehensively. At last, the problems and research suggestions were given for IGCT to be used in DC grid. The paper has significance to promote voltage conversation and power transfer with high-efficiency, high-density, highreliability and low-cost in dc grid.