China Science and Technology Network (CSTNET) originated from the project of National Computing and Networking Facility of China (NCFC) in August, 1989, and developed from the network of Chinese Academy of Sciences (CAS). After the development of nearly twenty years, CSTNET has covered 30 provinces, cities, autonomous regions in China via 13 regional sub-centers. We now have the high speed connections with more than 370 institutions in CAS and national-leveled organizations like China Meteorological Administration, China Academy of Forestry, China Earthquake Administration, China Academy of Agricultural Sciences and so on. We have high speed direct connections with 87 national laboratories and selected state key laboratories, 48 national engineering laboratories and national engineering research centers , 20 big science facilities and 39 field stations. Today, more than 1 million researchers and scholars in China are connected by CSTNET. Under the help of China-EU cooperation project Orientplus, we had successfully support many important applications on different disciplinary areas like high energy physics, remote sensing, meteorology, Gene, astronomy, biophysics. Some famous project are supported like Iter, eVLBI, GEPNETCast,, Dayabay,JUNO,CSNS,ALTAS,CMS,BELLE II .The current traffic speed between CSTNET and Geant has reached more than 5Gbps per day. We sincerely look forward to working with partners in the European Union to carry out more extensive and in-depth cooperation in more scientific research areas, joint efforts to promote comprehensive research cooperation between China and EU.