The purpose of this study was to examine the effectiveness of using the relapse prevention program for adult substance addicts. Based on the results from the study of educational needs for the relapse prevention program among substance addicts the 10-session-relapse prevention program was developed. Then the researcher conducted the relapse prevention program for 15 adult methamphetamine addicts from Aug. 3 1999 to Sep. 4 1999 at the probation office in Suwon, South Korea. For examining the effectiveness of using that relapse prevention program the Social Adjustment Scale-Self Report(SAS-SR), McMullin Addiction Thought Scale(MAT), and Self Esteem Rating Scale(SERS) were used whether or not their social adjustment level, self-esteem level, and addiction thought level were improved. This study employed one group pre-post test research design as a quantitative purpose and in-depth interview as a qualitative purpose. For a qualitative purpose in-depth interview was conducted in not only between sessions but also after sessions dealing with their current life problems. For a quantitative purpose the analysis strategy employed here was frequency and t-test. Results shows that addicts who took the relapse prevention program consistently reported the improvement of their social adjustment level, self-esteem level, and addiction thought level although there were no statistically significant between pre and post tests. The implication of study findings will be discussed.