关键词: 否定信息, 触发词检测, 覆盖域界定, 焦点识别

Abstract: In natural language, negation is a common and complex phenomenon, it can inverse the truth value of proposition, the polarity of sentiments and attitude, the position of opinion and so on. Negation recognition plays an important role in many fields such as information retrieval, sentiment analysis, text mining, information extraction. It also has a positive effect on a further step towards text understanding. A survey of negation recognition is analyzed. This paper mainly introduces the framework of negation recognition task, and elaborates the solution of the task that includes three subtasks：negation cues detection, negation scope resolution and negation focus detection. Finally the problems of the current research and the future work directions are pointed out.

Key words: negation, cues detection, scope resolution, focus detection