A system and method for dynamically transferring satellite data packets through GPRS (General Packet Radio Service) in an AGPS(Assisted Global Positioning System) is disclosed. The satellite data are transmitted in dynamic size of segments so as to improve the transmission efficiency. When the network communication is stalled or broken, the segments being successfully received are not necessary to be resent. But only the failed segments are re-transmitted so that the time and bandwidth for data transmission are reduced, and the positioning process is prevented from delay by the transmission failure.