It is our pleasure to invite you and your collaborators to attend the International Workshop on Viroids and Satellite RNAs(IWVdS) in Beijing, China, in August 2013. This event, which will take place on 23rd-25th August 2013, would provide a stimulating platform for exchanging research developments and tracking technical progress on viroid and satellite RNA research. The IWVdS is a Pre-Conference included in the program of the 10th International Congress of Plant Pathology (ICPP), to be held in Beijing from 25th to 31th August 2013, thus allowing participants to attend both IWVdS and ICPP minimizing time and costs. IWVdS has been jointly sponsored by the Institute of Plant Protection, Chinese Academy of Agricultural Sciences (IPP-CAAS), the Institute of Plant Virology, Italian National Research Council (IVV-CNR), and the Beijing Society for Plant Pathology (BSPP), and is supported by the State Key Laboratory of Biology of Plant Diseases and Insect Pests (SKLBPI), and the Chinese Society for Plant Pathology （CSPP). The financial support of these Institutions allowed us to lower the registration fees as much as possible. The registration fee includes two-day accommodation, access to the oral presentation session, lunch, dinner and coffee breaks, conference abstract book.