Abstract: In this paper, a SDH fiber transmission communication system of Chengyu highway is introduced,which referring to network topology, network synchronization, network mangagement ans network perfomance objective etc. It's network management system is designed follewing the telecommunication management network concept specified in the ITO-T and it can support future services based on ATM or other new technologies. The results of experiments showed that the system's perfomance is perfect and the design is rational and satisfied.