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At present， the provinciallevel meteorological WAN of Hubei is through one 〖JP2〗telecommunications〖JP〗 line to realize communication between provincial and municipal levels，and uses a dialup VPN line to make backup. It is not enough to guarantee the reliability of data transmission. So a special line is designed to realize doubleline backup. At the same time， a switch is added for provincial network interconnection, to replace the router for municipal network interconnection.The data are divided into two classes: convention data and video data.Different transmission modes are defined. Convention data adopt the OSPF dynamic routing method for transmission, and video data adopt the static routing BFD linkage for transmission, to guarantee the 4 Mb/s bandwidth by QoS. It can realize reliable and more reasonable data transmission between provincial and municipal levels.