This study conducts a comparative analysis on cognitive map of residents before and after Fukushima nuclear accident. In doing so, this study explores negative feedback loop among the participation, government image, and demonstration. The result shows that the cognitive map of residents was greatly changed. Especially, the issue regarding conflict has become more diverse and intensive efforts to anti-corruption has been more demanded. With respect to before and after, however, the results of this study show followings. First, sharing of information and participation is the only independent variable. Second, the residents use the possibility of problem solving as a basis for selecting conflict management methods. Third, residents are recognized the open of information and sharing information differently. As a result, this study suggests that the validity and fairness of participation process would be useful conflict management methods.