Professor Denis Bastieri, from University of Padova, Italy, was academically  invited to visit our observatory on12th and 13th ,November.During the visit our researchers showed the IDV data processing and introduced the  equipments and projects of observation about Urumqi 25m radio telescope. Prof. Denis  Fermi introduced the data processing and procedures about the Fermi (Fermi Gamma-ray Space Telescope)data and made an academic report. Prof. Denis is also one of the  National Institute of Nuclear Physics (INFN) members and involved in  MAGIC (Major Atmospheric Gamma-ray Imaging Cherenkov Telescope) and the Fermi Gamma-ray Space Telescope .