Group behavior under the network environment is complex, and the evolution trend is the result of various factors’ interaction, so it’s hard to master. How to evaluate the evolution of network group behavior is an important part of social crisis management research. But so far, scientific quantitative assessment method has been seldom. This paper introduced the fuzzy comprehensive evaluation method. Then, the evaluation index system of network group behavior evolution was constructed, and the evaluation model of network group behavior evolution situation was set up through the analysis of behavior characteristics and evolution process of network group, which provided a new way to study the uncertainty, fuzziness and dynamics in the evaluation of network group behavior evolution.
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