Abstract: Some bloggers in the virtual community could impact other partners' opinion and guide the actions of other members by publishing high-quality blog post, which is considered to have high influence. We regarded them as important informative resources. Detecting the influential' s activities gives assistance to external world' s decision. We proposed some measurements of influence by taking advantage of the blog's unique form,and ctuantify influence with resped to topics. I}he experiment shows that model can overcome shortcomings of only using the simple statistical characteristics to identify important blogger,which is an effective method.

Key words: LDA model,Hot topic,Blog influence