Event-based prospective memory (EB-PM) is defined as remembering to perform a planned action when a specific event occurs, or a specific cue is displayed. Previous studies indicated that EB-PM processes are affected by emotion. In the current study, emotion is considered within the valence and arousal dimensions. Accordingly, the effects of emotional valence and arousal on reaction times in an EB-PM task were investigated. A total of 58 (Female: n=32) university students aged 18 to 30 participated. Pictures used in experimental tasks were selected from IAPS. In the experiment, participants completed the PM task and 1-back visual working memory task simultaneously within the EB-PM task. First, they completed a practice trial of the 1-back visual working memory task. Thereafter, PM targets were presented, and PM instructions were given consecutively. During the 8.5-minute delay between instructions and the EB-PM task, participants completed PANAS and Digit Symbol Task. Finally, participants performed the EB-PM task and recognition test. The experimental design is 3(valence: positive, negative, neutral)x2 (arousal: high, low) within-subjects design. DV was the reaction time in the PM task. ANOVA results indicated that the main effects of valence and arousal were significant (p<.05). Reaction times for both positive and negative pictures were significantly longer than neutral ones. Besides, reaction times for pictures at high arousal levels were significantly longer than at low arousal levels. However, the interaction effect of valence and arousal was not significant. It is concluded that both dimensions of emotion caused an increase in the time of PM processing.