Abstract: In the field of computer security，particularly network security，network vulnerability of the model is very important.The ultimate aim is to guide security administrator simulating attack scenarios，analysing the relationships between network vulnerability and building defensive mechanisms.This paper discusses the concept of network vulnerability and modeling development process，introduces some typical vulnerability modeling methods，induding the attack on the tree，plan attacks，infiltration map，privileges upgrade plan，Petri net，the state plans，requires/provides model.In conclusion，the paper summarizes the future direction of development.