Background: This study was aimed to test the power of explanation of stress vulnerability for stress level, which is the subscales of IESS. Methods: 237 University students (3∼4 grade) and late 20∼early 40's administered IESS twice and these data were analyzed. Results: Correlation between all scales of stress vulnerability and stress level were positively significant (r=0.18∼0.47). Results of multiple regression analysis suggested that regardless of test time, perfectionism and avoidance scale of stress vulnerability had the biggest explanation power for stress level and stress vulnerability could explain the future stress level significantly. Conclusions: These results suggest that IESS which is consisted with stress vulnerability and stress level might be utilized to predict future stress.