简要对比DDN、SDH光纤、卫星和无线CDMA等几种通讯方式的优缺点，介绍重庆区域测震台网所使用的传输方案，即以SDH光纤传输为主、无线CDMA为辅的双链路备份传输方案。重点介绍该传输方案的原理和实施方法，详细讲述台站及台网中心的路由配置和相关说明。通过在重庆市区域测震台网的运行，结果发现，传输效果较理想，测震台网台站运行率均达到98%以上，证明了该方案应用的可行性。

Based on comparisons of communication modes of DDN, SDH, satellite, and wireless CDMA, the duallink backup transfer mode, in which SDH is used as predominant mode while wireless CDMA is an auxiliary one, is designed for the Chongqing Regional Seismic Network (CRSN). The emphasis is placed on its principle and implementing methods, routing configuration and relative explanation are also specified for station and central network clients, respectively. The station running rate is higher than 98% after this transfer mode was applied in the CRSN. It suggests that the duallink backup transfer mode is a feasible and perfect one for regional seismic network.