Very short reach (VSR) is an optical communication system to transmit STM-64 data over a short distance (about 300 m).It has lower cost than the common 10 Gbps system.It is mainly used to link two equipments of different network layers,such as switchs,CRs,ADMs and WDM terminals.The paper introduced four specs of VSR,analyzed their advantage and disadvantage and discussed the applications of VSR.