We are pleased to invite you to attend the 18th International Conference on RF Superconductivity, SRF2017, to take place on July 17-21, 2017 at the International Conference Center of Lanzhou University, Lanzhou, Gansu Province, China. Lanzhou is located at the upstream of Yellow River, which is the cradle for the oriental civilization. It enjoys a long history of more than two thousand years. Now the conference website is available at http://srf2017.csp.escience.cn/and will be updated frequently in the coming weeks and months.