SYSID 2015 is sponsored by the IFAC Technical Committee on Modeling, Identification and Sigal Processing, Academy of Mathematicis and Systems Science, Chinese Academy of Sciences, and Technical Committee on Control Theory, Chinese Association of Automation. SYSID is organized every three years. The previous edition, SYSID 2012, was held in Brussels, Belgium. SYSID 2015 will be the second SYSID symposium to take place in Beijing, and the first one was in 1988. The symposium covers all major aspects of system identification, experimental modelling, signal processing and adaptive control from theoretical and methodological developments to practical applications in a wide range of application areas. The aim of the meeting is to promote the research activities and the cooperation between researchers in these areas. To enhance the applications and industrial perspective of the symposium, participation of authors from industry is particularly encouraged. Papers presented at SYSID 2015 will be hosted and freely available on-line on the IFAC-PapersOnLine.net website and will be citable via an ISSN and a DOI.