Purpose: The purpose of this study was to compare the effectiveness of debriefing with video and oral debriefing alone by undergraduate nursing students in the nursing educational simulation setting. Methods: Nursing students participating in experiment were 168. Data was collected for each group after the simulation including debriefing. Result: Experimental group who experienced simulation debriefing with video and control group had differences in clinical practice items according to characteristics. Experimental group who experienced simulation debriefing with video had significantly higher debriefing satisfaction than control group who didn't experience that. Conclusion: This study found that simulation debriefing with video was effective educational method to promote debriefing satisfaction. It is needed to find the relation between clinical practice and debriefing satisfaction.