Abstract: The regime forecast system in Xinfengiiang hydropower station was founded in 1990, adapting VHF ultrashort wave to transmit data signal, it has taken full of economic and social profit since it has been put into operation. However, the basin is located in the mountain northern Guangdong Province, there are much difference in terrain and physiognomy, which increase the maintenanee cost and fault time on system, the system reliability is decreased much. In Dec 2001, 12 rainfall stations in the system have been technically modified, including converting the ultrashort wave communications to the satellite communications(Inmarsat-C), removing the original 3 mountain relay stations, keeping the 4 remote measurement stations near center station in communicating with VHF ultrashort wave. At present, the system has been operating in the combined net of those two.