The design idea and implementing method about VPN ( virtual private network ) access service in remote maintenance for seismic monitoring network is introduced. It is also discussed that the realization of VPN in China Seismic VSAT Network. 系统介绍了将VPN技术引入地震监测网络远程维护工作的技术思路,以及该技术思路在中国地震局卫星数据通信网中的实现方法。