Abstract: In recent years, some countries around the South China Sea pledged their sovereignty over islands and reefs and seized maritime rights by means of undersea feature names. In order to safeguard national sovereignty and maritime rights, China has intensified the work on undersea feature names. A database of the undersea feature names in the South China Sea was constructed based on the idea of information management, the application for the service work was carried out, the query and publishing system of undersea feature names in the South China Sea were developed, and the structure and function design of the system were discussed. It can meet the needs of users and improve the efficiency of undersea feature naming. This series of work manifests the achievements of China’s investigation and research in the South China Sea, and provides technical support for the study of the proposal of undersea feature names in China.