With the increasingly difficulty of current power grid construction and the rapid development of renewable energy sources, distributed generation and smart power grid technology, HVDC flexible technology provides a new approach to make up for conventional HVDC or HVAC transmission technology. Based on this, the features and economies of HVDC flexible technology is summarized. Following the introduction of practical applications abroad and in accordance with the actual requirement of energy sources and power in China, the application perspectives of HVDC flexible technology are analyzed on renewable energy sources development, distributed generator connection power supply for isolated area and urban power network. Furthermore, the suggestions for studying and popularizing the new technology is provided.