It is our great honor to welcome you to the Low Level Radio Frequency workshop 2015 (LLRF15), hosted by Shanghai Institute of Applied Physics. Chinese Academy of Sciences (SINAP. CAS). The workshop will continue to share experiences, present status of our work, and discuss developments and prospects in the field. This is the seventh workshop in LLRF, Previous workshops were held by Jefferson Lab, CERN, ORNL, KEK, DESY, SLAC/LBL. The workshop venue is the site of SSRF, located in Zhangjiang hi-tech park, where can be reached by Metro line 2 or taxi from the Pudong international airport (PVG), or magnae and transfer other traffic tools.