RNA interference(RNAi)is the post-transcriptional gene silencing based on sequence-specific degradation of mRNA, and triggered by double-stranded RNA.RNAi technology is widely used in gene therapy and research of gene function and almost become a standardized technical tool with very broad prospect. The eyes with immune privilege are very suitable for the treatment of RNAi, which has been widely used for a variety of eye diseases, especially cataract. This paper briefly introduces the basic principle of RNAi technology and summarizes the recent research and application of this technology in cataract.