The 2nd International Conference of Mechanical System Dynamics (ICMSD2023) is devoted to "Technology Innovations by Understanding Mechanical Dynamics", with 18 sessions to promote research in dynamic theories on complex structures, multidisciplinary integration, and advanced technologies for applications. It is held on September 1-5 in Peking University, Beijing, China. The conference is expected to provide a platform for academic researchers and engineers in the field of mechanical system dynamics to exchange scientific and technical ideas.