With the development of high-throughput sequencing technology, more and more RNA editing sites are detected based on RNA-seq sequences. To help users determine the interested editing sites, we developed "Editing Site Identification". Besides EDK, it also contains two data sources, namely REDIportal and DARNED, to expand RNA editing sites in normal or case condition. "Editing Site Identification" provides an important function to determine whether user-uploaded sites are RNA editing sites and offers basic information of these sites. Additionally, it will also indicate the link between the site and diseases in EDK.