The National Scientific and Technical lnformation Network (STINet) has reached a certain size after two year development, But the developing speed is reduced due to the over-high telecommunication cost. So the State Science and Technology Committee of China (SSTCC) has decided to set up the VSAT backbone network which will provide STINet with a communication platform to reduce the telecommunication cost and provide a unified transferring platform for other systems and networks of SSTCC. The article introduces and analyses the current situation of STINet, the possibility and the structur of the above project, the VAST network of  SSTCC.