Collecting all kinds of distributed generation and constructing AC/DC hybrid power grid have become one of the major measures to overcome the energy crisis. However the lack of stable and reliable fault protection technology has become one of the main factors, which limits its development. Firstly, this paper summarizes the development situation of AC/DC hybrid power grid at home and abroad, focuses on the conception and plan of super grid from Europe, China, the United States, Japan, and other regions and countries. And then the system structure, characteristics and key technology of AC/DC hybrid power distribution are analyzed in detail, and the particularity and requirement of protection technology are summarized from the content of fault area, fault feature and fault protection. Finally, the technical research direction on protection in the future is prospected. This work is supported by National Natural Science Foundation of China (No. 51377023).