Lots of social attention has been paid for the serious accident of power grid caused by bipolar latching in ultra high voltage converter station, which are related to the future development of ultra high voltage infrastructure. Compared to the traditional roughly overall load shedding approach, load fast control penetrates into the equipment of users and narrows the effect area dramatically. In this paper, the process of load fast control approach for ultra high voltage fault is analyzed first. Then, the communication framework is designed, and more details are discussed from three aspects, which are the private wire network of state grid protective relay and stability system, the load fast control communication network in power marketing side, and the load fast control terminals communication network in users. Consequently, key technologies of priority-tag based VLAN network, VPN network, Optimal scheduling of communication queues based on SPQ and WFQ, and information security protection are researched. These techniques can improve communication reliability, immediacy and safety of fault processing. Finally, the 1100 kV ultra high voltage converter station in Chengdu is treated as example to analyze load fast control communication. This work is supported by Prospection Research Project of Jiangsu Province (No. BY2016076-12).