Ji Jiuming;Chen Jinhui;Li Nan;Sun Jiqing
Event Extraction is a process which extracts a series of events which consists of time, place and character.First, the paper summarized the literature about event extraction, and gave the main method and model of event extraction.Meantime, it analyzed the results of these methods and explore the effect and application of these methods.The result was that, the research of Event Extraction was going on, which is focused on the internet, the We-Media, and Professional documents.The internet is about Financial information, conference information, unexpected events, personal resume.The We-Media includes Microblogs and WeChat.The professional documents are about Military, law.the algorithm have SMV, CRE, ME, Pattern Match, Cluster.the number of literature using pattern matching algorithm is more, the comprehensive effect of trigger method is better than that of pattern matching algorithm, but the recall ratio of trigger method is low in areas.