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This paper proposed a new technology for HVDC start-up and operation using VSC-HVDC system. The new concept of the technology is to start HVDC when its receiving side is passive network. The motivation of choosing this technology is to enable HVDC to operate under small amount of power delivery condition as the receiving side is passive network. A physical model of starting HVDC by VSC-HVDC is developed. Moreover, a control system is designed in dq reference frame. In order to testify this technology, the dynamic performance of starting HVDC using VSC-HVDC is investigated. Simulation results obtained using PSCAD/EMTDC show that with the use of the proposed technology, the HVDC system can start successfully and feed small amount of power to passive network. The technology proposed exerts the advantage of VSC-HVDC system and increases the availability ratio of supplying power to passive network.