The purpose of this study is to suggest a basic materials in criminal policy making by analysing the effectiveness of probation to the DWI offenders. For this study, written investigation data of 32 drivers who had the experience of being sentenced probation and imprisonment for the DWI in a police station, Busan Province Metropolitan Police Agency, 2006-2007, were collected. To compare re-offense deterrence effectiveness of probation and imprisonment, three MOEs(Measurement Of Effectiveness)-observance duration, ACB(Alcohol Concentration in Blood), and driving distance-were used. This study conducted Kolmogorov-Smirnov test to compare deterrence effectiveness between probation and imprisonment. The result of this study showed that probation is more effective than imprisonment: a group of sentenced probation is longer in observance duration, lower ACB, shorter in driving distance than that of imprisoned. This study has some limitations. First, socioeconomic variables such as education level, marriage status, and economic condition were not controlled. Second, the number of sample is small. Nevertheless, this study made valuable contribution in that analysing the effectiveness of probation with empirical data and also the first attempted to use the new MOEs.