The study is to examine the immediate effects of a mental health promotion program for disaster rescue workers. A five-day bio-psycho-social-based mental health promotion program was developed by the request of a disaster rescue team. The program is positive-psychology oriented for it is to enhance participants’ wellbeing. The study examined the moderation effect of subjectively traumatic experience (STE) on the program effectiveness. The study data is from 39 rescue workers who have involved in disaster rescue work, and 18 of them reported subjectively traumatic experience (STE). The participants completed Resilience Scale (Ho, 2008), Approaches to Happiness (Seligman, 2013), and Satisfaction with Life Scale (Diener et al., 1985) prior and post their program participation. Wilcoxon Signed-Rank Test showed support for the program’s immediate effectiveness and STE’s moderation effect on the effectiveness. Life satisfaction and resilience significantly increased for the STE groups, while happiness pursuit significantly increased for the non-STE group. Event centrality and sensoryprocessing sensitivity are proposed as possible explanations for STE’s moderation effect.