From Oct. 17 to  21, 2011, the 12th RHESSI workshop and high energy solar physics  symposium was successfully held in Purple Mountain Observatory, Chinese  Academy of sciences. There were nearly hundred of scientists  participating this workshop. They come from eleven different countries  including US, France, UK, Germany, Italy, Russia, Austria, Switzerland,  Japan, Koren and China.

RHESSI is a  high energy solar spectroscopic imager launched by NASA in Feb., 2002  which is still in operation. Since its launch, the RHESSI related  science has been a hot topic in the field of high energy solar physics.  Annually at least one RHESSI workshop is organized. The previous eleven  workshops have been held in US for five times and in Europe for six  times. In RHESSI's ten-yearanniversary, for the first time, the workshop  is held inAsia and in China. It has drawn the biggest attention in the  solar high energy co.mmunity, no matter in terms of the number of  participant countries or in terms of the number of participated  scientists.

The workshop  was divided into five working groups: data analysis and imaging, hard  X-ray and electrons, gamma-ray and ions, multi-wavelength studies, and  theoretical modelings. Different from previous RHESSI meetings, this  time it has been arranged in such a way that workshop and symposium were  combined to ensure sufficient time for presentations and discussions.  80 talks given in this meeting presented the latest progresses in  different subfield of high energy solar physics, and also draw a blue  map of the space-based and ground-based solar missions in the future.　

High energy  solar physics in China develops rapidly in recent years. A total of 14  talks were presented by Chinese scientists. Dr. Gan, the deputy director  of Purple Mountain Observatory, chaired the LOC and made a speech in  the panel discussions about some important issues in the high energy  solar physics. The on-going ground-based solar telescopes and the  futurespace-born solar missions in China are interested by the  participantsas well.

The national  nature science foundation of China and the Chinese Academy of Sciences  are greatly acknowledged for their support to the 12th RHESSI workshop  and High Energy Solar Physics Symposium