Abstract: As a sub-system of the space environmental ground simulator for the National Major Science and Engineering Project, the numerical simulation and central monitoring system provides various services such as the data acquisition, the experimental monitoring and control, the safety monitoring and control, the centralized display, the data storage, the operation management, the numerical simulation, the data sharing, and the system maintenance. Based on the loading requirements of all kinds of tasks in the network, and in view of the characteristics of the system network involving various services, a large amount of data and a complex network scale, the star topologyis adopted. Each node is deployed with dual devices, and the firewalls are in Acitve-Acitve routing deployment. Meanwhile, the horizontal integration and the vertical separation of the network are implemented by the network virtualization technology. Thus, the numerical simulation and central monitoring system network with multi-service unified load is constructed, with simplified network layout, improved network bandwidth, and enhanced network reliability and security, to provide differentiated network services for various experiments in one physical network.