In this study, the psychiatric symptoms of the 391 prisoners (368 male, 23 female), who were sentenced for the first time, were assessed. The Symptoms Check List (SCL 90R), General Health Questionnaire (GHQ), and Multiscore Depression Inventory (MDI) were administered to all subjects in order to assess psychiatric symptoms. Gender, age, education level, marital status, type of crime, duration of sentence were also investigated. Results showed that the scores of the prisoners for the three instruments were higher than non-prisoner subjects of other studies. Age was negatively and significantly correlated with the MDI and the SCL 90R scores. Period of sentence was not correlated with the SCL 90R, the GHQ, and the MDI. Females scored higher than males on the three instruments. The MDI scores differed significantly with education level and type of crime. Participants with lower education had higher MDI scores than those with higher education. Also, those sentenced for theft had higher MDI scores than those sentenced for swindling and drug use, sale, or purchase. No significant differences were obtained for marital status.