12th International Symposium on Parallel Architectures, Algorithms and Programming (PAAP’21) will be held in Xi’an, China, December 10-12, 2021. PAAP 2021 will provide a forum for scientists and engineers in academia and industry to present their research results and development activities in all aspects of parallel architectures, algorithms and programming techniques. We devoutly wish participants to learn the basic theory of a gradual approach, practical experimental data, new business models, and the latest academic trends from this conference.