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The current trend of development is DC input (with) electric power grid. However, the development of HVDC circuit breaker is one of the key technologies. It designed a prototype hybrid HVDC circuit breaker, which use the high-voltage power electronics, and the controller of DSP + FPGA combination. It researched the monitoring device, and proposed the control method of threshold interval and the control timing. It designed a prototype hybrid HVDC circuit breaker, Which form the high-voltage direct current transmission, energy diversification, the development needs of combining mechanical switch and solid medallion. Through the prototype sub-gate opening test and fault tests proved that the developed prototype HVDC circuit breaker with the fast opening operation, the advantages ofSgood action consistencySetc..