The purpose of this study is to examine the factors which give influences on the job satisfaction of probation officers and to suggest the ways to improve their job satisfaction. For this study, nine factors which have been derived from the Herzberg’s two factors theory are considered as the possible explanatory variables for the job satisfaction. Using SPSS statistical package, the analysis of the data examines the descriptive analysis, T-test, ANOVA, Correlation, and Multiple regression. The result of this analysis showed that the significant factors related to the job satisfaction were achievementㆍrecognition, company policy, supervision, working conditions, and job security. First of all, achievementㆍ recognition was the most important factor. Based on the result, to improve the job satisfaction of probation officers, the job dissatisfaction needs to be resolved through the improvement of hygiene factors(company policy, supervision, working conditions, job security) and job satisfaction would be improved through the sufficiency of motivators(achievementㆍrecognition). For these, the following plans are needed: legislativeㆍinstitutional reformation, the establishment of more probation and parole offices, an increase of workforce, budget increase, public support of the community treatment, job redesign and the continuous innovation of probation and parole organizations.