Abstract: China has entered the network of public expression of mobile Internet era,network public opinion will experience a latent public opinion,networking crowd,arguing aggregation and influence faded four stages of the process of change in the agglomeration effects are obvious.From quantitative to qualitative change,the network of public opinion through the “keyword” calculation to determine the critical value of the various stages of network public opinion.Meanwhile,according to the changes of network public opinion,can draw an irregular zigzag,pyramid-shaped,glacier-type three categories curve.Therefore,the changes of public opinion research network,reducing network for the probability of occurrence of mass incidents,maintain social stability and the government’s image,has a very important practical significance.

Key words: keywords, internet public opinion, change cycle, variation, graph