Abstract: Currently it is difficult to quantitatively observe,analyze and control Emergent Internet Public Opinion (IPO).On the basis ofanalysis of user network relationship,a series of quantitative metrics are selected to describethe propagation of Internet Public Opinion.Their selection reasonsand computing method are explained in details.The validity of quantitative metrics is proved by experiments.According to the quantitative analysis metrics change apparently when the number of users change and these changes mayreflect the changes of Internet Public Opinion in different degrees and levels.

Key words: complex network, internet public opinion, propagationmodel, quantitative metric