The present study explored the effects of state overconfidence on persistent behavior with consideration of feasibility and desirability as mediators. The persistent behaviors of 61 participants (35 women, 26 men; M age=20.9yr, SD=1.9), placed in overconfidence and under-confidence groups based on random positive or negative bogus feedback, were measured. Results showed that participants with overconfidence were more persistent in solving problems than were those with under-confidence. Further mediation analyses revealed that the rating of the feasibility rather than the desirability of the task mediated the influence of state overconfidence on persistent behaviors. These findings provided future support for the self-justification hypothesis, and addressed arguments regarding the origins of overconfidence.