Abstract:At present, our country is basking in the accelerating period of social transformation with deepening reform. The problems such as contradiction between official and people, gap between the rich and the poor, and social inequality are growing. In the process of the social emergency, influenced by negative emotions, social groups or individuals from the daily state of calm (the normal state) transit to the excited state (the excited state), and the energy required to overcome this transition is social activation energy. Specifically,“the normal state” refers to the groups or individuals in society in a positive, active, and up emotion, so-called social harmony without the external stimuli. Any network positive energy maintains the stability of“the normal state”.“The excited state” refers to the large number of false information, violence, crime, and other negative emotions in society (specially in the virtue network). If those negative emotions are not evacuated timely, the groups or individuals in society will have the move to undermine the social harmony and stability, called“the excited state”. The measurements for the social activation energy are divided into the following main steps. First of all, regarding the“social stability and warning” as the purpose, to build a sample library for elements of emotions, including“text”,“expression” and“punctuation”. Then, to match the corresponding emotional elements in the sample library by calculating the emotional value of the information to be analyzed through extracting the the information you want to analyze in terms of the three elements mentioned above. Finally, to use the emotional value of different social agents in normal state and excited state generating the social activation society of the agents, combining with the geographic location to get the“social activation energy” of different place all over the country. If the social activation energy trend in certain areas is relative high, it indicates that the social limits of the people’ s mental state is larger. When unexpected event happens, they can keep their emotions stable. If the social activation energy trend in certain areas is low, it indicates the poor mental capacity for bearing the negative emotions. Some individual incidents can provoke the psychological resonance, which is the first risk of threatening the social stability. Over the years, buses have been targets in bombings and arson incidents in several Chinese cities. Based on the algorithm of social activation energy, the detailed numerical result of arson incidents are calculated in this study. As shown by the calculated results, the social activation energy of bus arson incidents generally is in a lower level. Bus travel is closely related to people’ s daily life, so bus arson resonates with netizens on an emotional level easily. Considering the above-mentioned, from the perspective of the modern social governance capacity, to grasp the relationship between social negative emotions and emergency on the basis of system analysis, effective measures, and scientific judgement, correct understanding, measuring and judging social activation energy with help to improve the research of early-warning system for social stability and social governance. Specifically, the government needs to work from the following three aspects: continue solid job and maintain the normal state of society, ease the social conflicts and weaken the social excited state, and guide the public opinion and lower the social activation energy.