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There exist some common problems in the backbone network of provincial meteorological services. The loadsharing, for example, has not been achieved in different network lines, so that the backup line is often idle, and the asymmetric routing between provinces and cities has an effect on remote video conference service. There is no control of bandwidths for different tasks, and there are mutual influences among different tasks. Some technical means are proposed aiming at above problems. Through introducing the policy routing to shunt data transmission, the benefits of multiple lines are improved, so the loadsharing is realized, and the problem of asymmetric routing is solved, so that the effect of video conference is guaranteed. The occupied bandwidth of different tasks on lines is managed by introducing a series of QoS strategies, which can not only ensure the bandwidth of key tasks such as realtime data transmission and video conference, but also provide dynamic bandwidth resources for other tasks, thus to make full use of the existing network bandwidth. A series of tests indicates that the optimization and upgrade of the entire network has reached the design target, which provides a good reference for the network design of other departments.