Plasma facing components (PFC) mainly include upper and lower divertors, high field plate, passive plate and low field plate. All the first walls are metal walls (tungsten and TZM), except for the few graphite tiles on the high field plate. The main function of PFC is to remove the heat deposited on the first wall. At present: the highest heat removal capacity of the divertor can reach steady state 10 MW/m² and transient state 20 MW/m², other first wall heat removal capacities can reach steady state 1MW/m² and transient state 2 MW/m².