With the increasing complexity of the electromagnetic environment, the inherent vulnerabilities of global navigation satellite systems gradually revealed, and it is of great significance to use China coastal long-wave navigation system as backup of the Beidou navigation satellite system. This article introduced that using the existing RBN station to transmit the differential information, which effectively improved the position accuracy of the long-wave navigation system, and this will be the technical foundation of constructing the long-wave navigation differential system in China.