The valve base electronics system of high voltage TSC is introduced in this paper. The function and operating characteristic of high voltage TSC’s VBE are analyzed and a TSC’s VBE based on photoelectric trigger technology is proposed in accordance with principle of TSC and the series structure of thyristor valve.At the same time

both operating principle of valve base electronics system and thyristor controlled unit are discussed.It is proved by the 10 kV operation test of TSC valve base electronic system that the system overcomes the shortcomings of electromagnetic valve base electronics system effectively and can meet safe and reliable operation requirement of TSC in the network.