The effectiveness of a REBT based stress management program for maladjusted high school students was examined. Trainees were 26 male high school students. They were randomly assigned into an experimental group( n = 13), a control group( n =13). The experimental trainees were given 10 sessions of REBT based stress management training program in 5 weeks(twice a week, about 100 minutes per each session). Trainees were compared with a control group on measures of high school students' perceived stress. Compared with controls, the training program participants showed significantly greater reduction on self report measures of school life stress, physical health stress, habitual attitude stress, and family life stress. but there was no significant difference between the two groups in peer life stress. To observe the long term effect of the program, a follow-up study was implemented 6 months later. Follow-up improvements were found on behavioral problems in the training program participants. Finding support the value of REBT based stress management training program for preventive stress and behavioral problems in the school setting.. Several suggestions were made for future researches and programs developments.