[Purpose/significance] Automatic detection of hot events on the Web( from news and microblogs) and extraction of descriptive words to describe them is important for detecting internet public opinion. [Method/process]Current methods to extract descriptive words mainly rely on association rules or combination of multiple n- grams,which often lead to noise words with imprecise meaning and potential meanig drift. In this paper,a compound word based feature extraction method is proposed and used to represent new...