Aims: Job satisfaction is one of the most challenging organizational concepts and the basis of many policies and guidelines of management for promoting the efficiency and productivity of organization. This research was conducted to determine the personal factors that affect soldiers’ job satisfaction . Methods: This research was a descriptive- analytical study and its participants were 165 soldiers that were selected according to stratified proportional sampling design from a military unit of province defiance and its subsidiary regions. In order to assess job satisfaction, Visoky & Crom job satisfaction questionnaire was used after some revisions and modifications in its items. The obtained data were analyzed at descriptive and inferential levels. Results: In the domain of personality characteristics positive, decisive and active individuals had higher job satisfaction in contrast with the other two groups (i.e. Inactive, negative and aggressive). The education level, months being in service as a soldier, the kind of membership in Basij, and the class of job had a significant relationship with job satisfaction. Conclusion: job satisfaction is a variable which is affected by personality characteristics and factors such as the education level, months being as soldier, the kind of membership, and the class of job and these factors are effective in increase of soldiers’ satisfaction and thereby their increased performance.