Background: Self-efficacy, as the belief in your power and abilities, and Mindfulness under the title presence of mind and being in present and moment now in the purposefully shape and empty of judgment have important role in depression and of course in rumination of thoughts.Materials and methods: In this descriptive study, 380 students of Islamic Azad University, Shahrood Branch, in the accessible sampling way were selected. Tools of gathering data were Sherer’s self-efficacy Questionnaires (1982), log rumination of thoughts (2007) and Kentucky’s mindfulness skills (2004). Data were used to predict by pearson’s correlation test, T test two independent groups and liner regression using SPSS software.Results: Between self-efficacy and rumination of thoughts and also between mindfulness and rumination of thoughts was a significant negative relationship, so with increasing self-efficacy to 0.23 and with increasing mindfulness, the rate of rumination of thoughts to the 0.21 is being reduced. But, between self-efficacy and mindfulness to the rate of 0.56, there was a significant positive relationship; it means that with increasing one, another one will be increased. There was a significant difference between the awareness of mind of male and female students. But, there was not significant difference between their mindfulness and their rumination of thoughts. Under the effect of self-efficacy too, the variety of mindfulness was excluded from the regression of rumination of thoughts and explain almost 0.08 of variance.Conclusion: With the increased self-efficacy and mindfulness through purposeful life and perception of moment now without judgment and belief of “I believe” rumination of thoughts that is the root cause of psychological problems, such as depression and feeling of disability, can be prevented.