The purpose of the present study was to investigate the relationships between negative affect (and mood) and reactions to it: aggression behaviour, patience, switch of mood and so on. In this study, 189 undergraduates were asked to complete a questionnaire which assessed frequencencies and intensity of experiences for anger, losing control, disconcertedness and buming out, and a open-ended questionnaire whose contents were causes, objects, and reactions for those negative affect and mood. The remarkable results were as follow: (1)Frequencies of experience for negative affect and mood related to those intensity. (2)The main causes of anger were interpersonal relationships. (3)The main causes of buming out were self-regarding problems. (4)Patience and switch of mood were used to react to negative affect more than physical attack was..