The task of information extraction(IE)is obtaining the objective information precisely and quickly from a large scale of data.Nowadays IE has already been an important branch of NLP,and its value is also becoming increasingly apparent.As a result,the industry and academia are putting more and more emphasis on it.This paper first reviewed the development process of information extraction,then summarized the new research progress about IE from 4aspect:named-entity recognition,anaphora resolution,relation extraction and event extraction.What's...