Abstract: To achieve the fast interrupting of fault current by high voltage direct current（HVDC） circuit breaker, this paper puts forward a new oscillating circuit of pre-charge direct current（DC） circuit breaker based on multiple series gaps and self-charging capacitor. The working of multiple series gaps with voltage divider network was introduced. Through simulation, the effects of the voltage frequency, equalizing resistance and voltage-dividing capacitance on the voltage distribution of multiple series gaps were investigated. And an experiment was performed to testify the turn-on action of this multiple series gaps. The principle and parameters characteristic of the switch trigger circuit with self-charging capacitor were analyzed theoretically. A simulation model was built to analyze the interrupting process of short fault current, and a current breaking experiment was performed to verify the feasibility of the oscillating circuit. The simulation and experiment results prove that the proposed oscillating circuit can generate an artificial zero current in the main broken section to achieve the interrupting of fault current.