Abstract: The new power system is an important component of the new energy system and a key carrier for achieving the "carbon peak and neutrality" goal. The Rreport to the 20th National Congress of the Communist Party of China emphasizes that it is necessary to accelerate the planning and construction of a new energy system to ensure energy security. The construction of an advanced DC transmission system that is digitalized, informatized and intelligent plays an important role in promoting the evolution of the traditional energy system towards a clean, low-carbon, safe, and efficient new power system. The period covered by the 14th Five-Year Plan is a critical window period for achieving the carbon peak goal as well as an opportunity period for promoting the construction of a new energy supply and consumption system based on large-scale wind and photovoltaic power bases, with stable, safe and reliable UHV transmission and transformation as the carrier. Currently, the construction of the new power system has made phased progress, but the large-scale reliable transmission and efficient utilization of new energy still face multiple challenges such as optimizing the network of the sending end system, enabling long-distance VSC-HVDC transmission, and ensuring stable operation of the receiving end system.In this context, Southern Energy Construction planned a special topic on "DC transmission technology for new power system construction", closely tracking the relevant hotspots and industry dynamics in the field of new power system construction and advanced DC transmission technology in China. We sincerely invite frontline teachers from universities and frontline engineers and R & D personnel from enterprises to share the latest research findings and industry dynamics. Through the collision of sparks of thought in this issue, we hope to provide valuable ideas for the high-quality and sustainable development of China's DC transmission technology.We would like to express our sincere gratitude to the authors, peer reviewing experts and readers for their support of this special topic. We hope that the publication of this special topic can provide a valuable reference for experts and scholars who are concerned and engaged in related research, thereby promoting the rapid development of basic theories and key technologies in the field of DC transmission.      Introduction to Special Editors-in-Chief     Dr. Yuan Zhiyong is a professor-level senior engineer and the director of HVDC Transmission & Power Electronics Technology Institute of CSG Electric Power Research Institute Co., Ltd. He has been engaged in research and engineering practice in the fields of DC transmission and smart grid technology for a long time. He has participated in the complete design of several HVDC and UHVDC transmission projects, as well as multiple projects under The National Key R & D Program of China. He has also worked as a postdoctoral fellow at Virginia Tech and The University of Tennessee in the United States. He currently serves as a member of multiple standardization organizations including the Electricity Quality and Flexible Transmission Standards Committee in the power industry and the Distribution System Standards Committee in the energy industry. He has received multiple awards such as the First Prize of the Mechanical Industry Science and Technology Award and the First Prize of the China Electric Power Innovation Award, published more than 30 SCI/EI papers and holds more than 10 licensed invention patents. Currently , Dr. Yuan Zhiyong is leading a team to engage in research and development and engineering applications in various fields, including new energy DC transmission systems, high-power power electronics technology, MVDC and LVDC distribution systems, and new energy storage technologies.Sun Potao is an associate professor at the School of Electrical Engineering, Chongqing University. He holds a doctoral degree and is a doctoral supervisor. He has been selected for the "Youth Talent Promotion Project" of the Chinese Society for Electrical Engineering and the "Chongqing Talent • Youth Top Talent Plan." He has served as the organizing committee chairman, publishing committee chairman, and session chairman for multiple international conferences including IEEE ICHVE, IEEE ICEMPE, and ISH. He once served as an Associate Editor/Editorial Board Member of WSEAS Trans. Power Syst. journal. He is currently a youth member of the CIGRE China National Committee, and a member/secretary of the IEEE P3196 International Standards Working Group. In the past five years, Sun Potao has undertaken three projects funded by the National Natural Science Foundation of China, one subproject of the National Key R & D Program, one pre-research project funded by the Equipment Development Department of the Central Military Commission, one project funded by China Postdoctoral Science Foundation, and one special project funded by the Chongqing Postdoctoral Fund. He has participated as a lead researcher in one key project funded by the National Natural Science Foundation of China and two projects under the 973 Program. Sun Potao has published over 40 papers, including over 30 papers published by him in the capacity of first author/corresponding author in SCI journals such as Chem Eng. J., Adv. Sci, ACS Appl. Mater. Inner., Appl. Phys. Lett., and IEEE Trans. He has also applied for and been granted more than 10 licensed invention patents. In addition, he has guided university students to win six provincial and ministerial gold awards and one silver award in the “Internet+” Undergraduate Innovation and Entrepreneurship Competition. He has also received the Winning Prize of the National Postdoctoral Innovation and Entrepreneurship Competition.