Background and Purpose: Regarding the important role of test anxiety in the emergence of some high-risk behaviors, the purpose of this study was to investigate the mediating role of the test anxiety in relation between procrastination and high risk behaviors in students.
 Method: The research design was descriptive and correlational. The statistical population of this study included all the high school students in Karaj during the academic year of 2011-2012 that 320 of them were selected through a purposeful sampling method. Data collected by Academic procrastination scale (Solomon and Ruth Bloom, 1984), Test Anxiety Inventory (Abolghasemi, 1375) and high risk behaviors scale (Brenner, Kan and McManus, 2002). Regression and path analysis were used to analyze of data.
Results: The results of regression analysis in a simultaneous way and using the proposed steps of Baron and Kenny showed that test anxiety can play a significant role as a mediator in the relationship between procrastination and high risk behaviors (P < 0.01).
Conclusion: Test anxiety can provide conditions for high risk behaviors along with procrastination; therefore, it is suggested that special attention should be paid to the predictive role of these factors in the study of high risk behaviors.