Abstract: By analyzing 40 mass emergencies of China during 2007-2011, this paper concludes that the collective behavior compositions are different in activities, interrelationship and emotion. The differences are embodied in three aspects. The threat to mass interest directly causes mass emergency. Group cohesion is the main factor that decides whether to take the collective behavior. The higher homogeneity will aggravate the intensity of conflict. Therefore, in order to solve the mass emergency, it should be paid more attention to the strong public mass conflict. When public interests are involved in public project constructions , the normal type of information release mode should be taken to communicate to the public. Real-time monitoring to the emotional reaction of related people should be taken, and the individuals who stimulate violence should be controlled. The interest expectations of the core participants in mass emergency should be reduced, and the impact of benefit compensation in the current events to the future should be weaken.