In this 14-day experience-sampling study, daily measures of emotion and life events were construct on a sample of 154 college students. The study investigated the emotion features of college students, the emotional reaction to life events occurred in everyday life, and the moderator role of emotion regulation, using Hierarchical Linear Model (HLM).The results showed that positive emotions were more normative than negative emotions in college students who experienced much more emotion in weekends; in the between-person level both kind of life events can predict emotion, however, daily positive emotion was unaffected by an increase in that day's negative events; The positive relationship between negative events and negative emotion was stronger for those high on expression suppression.