Abstract: The major technology and design involved in building Zhejiang Province tobacco wide-area network system were introduced. The choice of technical plan in network design was discussed according to the technical requirements of network construction, mainly including the choice of topological structure of network and communication line, network bandwidth and line redundancy, the choice of route protocol, the constitution of network management system, the security of network system, etc. The building of wide-area network laid the fundation for the informationization construction of Zhejiang tobacco industry.