To meet the growing demand for network performance between CN DA and ITER for each procurement package of participating in the International Thermonuclear Experimental Reactor (ITER), an optimization of WAN based on Riverbed is given. Riverbed has a three-layer optimizing system RIOS, which implements data streamlining, transport streamlining and application streamlining to achieve data and protocol optimization. In Addition, RIOS supports diverse Quality of Service (QoS) and high-availability-clustering functionality which makes system load-balancing and redundant, meanwhile, RIOS has realized the management optimization which makes the network deployment easier and faster.