In the power system with nominal voltage above 100 kV and rated frequency at 50 Hz or 60 Hz，TRV capacitor is connected between the busbar phase and ground or is in parallel with the current limiting reactor and connected into the busbar in series for limiting the transient recovery voltage（TRV）and the rate of rise of recovery voltage（RRRV）of the circuit breaker. In this paper，the key technical problem and solution of the TRV capacitor are proposed and the first set of 750 kV UHV and high power TRV，which is developed both at home and abroad，is introduced in the aspect of design structure，performance data，product characteristic，electric field calculation，seismic calculation and type tests. It can provide theoretical basis and valuable design experience for the development of TRV capacitor in China.