Objective: The purpose of this study was to investigate characteristics of the defense mechanism of oriental medicine students by using Ewha Defense Mechanism Test(EDMT) preliminarily. Method: We described the characteristics of the defense mechanism of oriental medicine students and compared the scores of EDMT with standard group. We analysed the differences of defense mechanism by sex (male, female) and age($leq$29 and $geq$30 yrs old) within oriental medicine students. The score of EDMT were verified by examination of one sample t-test and unpaired t-test. Results and Conclusions: First, there was no Major Defense Mechanism in oriental medicine students. Second, oriental medicine students had more defensive, passive inclination and used Evasion and Show-off more frequently. Third, the differences within oriental medicine students depended on age rather than sex. The younger students used immature and neurotic defense mechanisms more frequently, and the older students had more defensive and passive inclination.