The main result arising from recent studies on online human dynamics was reviewed.It concluded that the human activity has the heavytailed nature.Based on the empirical evidence from Blogposting and Wikirevising,it could be found that the distributions of the interevent time τ decay powerlike as τ increase at both individual and population levels.Furthermore,time scales and obtain heterogeneous decay exponents in the intra and interday range were pointed out.In the end,the significance of these features for the further research on the evolution of its group was emphasized.