Abstract: The real-time requirements of precision load shedding system for multi-infeed high-voltage direct current（HVDC）system,the control terminal traffic flow and existing communication access technology are analyzed.Then the archi tecture of the backbone layer based on the synchronous digital hierarchy（SDH）transmission network,the terminal layer based on the specific fiber multi-point to point communication is proposed.The communication network architecture of precision load control system is described in detail.The implementation schemes of key technologies are highlighted,such as security and stability control equipment of STM-1 communication interface,multi-user shared 2 M channel and so on.On this basis,the design methods of stability control equipment and different types of control terminal communication interface are discussed and the prototype development and system verification are completed.