The Eleventh International Symposium on Engineering Plastics (EP’2025) will be held in Harbin, Heilongjiang Province, China, August 3-6, 2025. International Symposium on Engineering Plastics (EP) is a biennial academic conference organized by Institute of Chemistry, Chinese Academy of Sciences, aiming to provide a high-profile platform for world-wide polymer scientists to exchange up-to-date research progresses and share innovative ideas on the future development of polymer materials. The EP series were first launched in Beijing, 2001, and have been successfully held at different cities in China for 10 times over the past two decades. The EP’2025 will continue the commitment to advancing polymer materials science and technology by setting its slogan as “Polymer Materials for a Better Life”. The organization committee cordially invite all of you, scientists, engineers, and students involving in polymer synthesis, characterization, and processing, to attend this symposium and have face-to-face discussion.