he complicated relations, the flattered media，the extreme Internet users are the main factors fule the network group events fire; the number logic, the witness logic the damage logic are the main logic of network group events for combustion;“inverted” type, “explosion” type, “mashup” type are the main modes of network group events for combustion. It is the possible mechanism of governing Internet rumors by law,reshaping media respowsibility,guiding public opinion on line to improve the antiflaming of network group events.