Welcome to the 2023 International Conference of Deep Space Sciences! The conference is one of the activities conducted during the 2023 Space Day of China, to be held in Hefei, the capital city of Anhui Province, from 22th to 27th April 2023. It is jointly organized by Deep Space Exploration Laboratory (DSEL) and University of Science and Technology of China (USTC). DSEL is co-established by the China National Space Administration (CNSA), Anhui Province and USTC. The laboratory is expected to carry out scientific, technological and engineering research focused on major national projects in deep space explorations. China will carry out more deep space exploration missions in the next 10 to 15 years. The fourth stage of its lunar exploration program has been approved, including Chang'e-6, Chang'e-7, and Chang'e-8. The next step of the planetary exploration program is also fixed. China will implement Tianwen-2 for asteroid sample return, Tianwen-3 for Mars sample return, and Tianwen-4 for Jupiter system exploration. Meanwhile, more deep space exploration missions, e.g., for the Sun, the heliopause, icy planets, and exoplanets, are in the plan. The International Conference of Deep Space Sciences brings scientists worldwide to discuss new developments in deep space sciences. The conference consists of a series of topical sessions. On behalf of the Organizing Committee, we feel deeply honoured to invite you to submit abstracts. New proposals for topical sessions are also welcome (Please contact kjiang@ustc.edu.cn).