This book CCIS 3183 constitutes the refereed proceedings of the 27th China-Japan Conference, CJCDCGGG 2025, held in Guangzhou, China, during September 12–14, 2025.

The total of 10 full papers included in the proceedings was carefully reviewed and selected from 50 submissions. These papers have been organized in the following topical sections: advances made in the field of computational geometry and focus on emerging technologies, new methodology and applications, graph theory and dynamics.