This study was conducted to assess the effectiveness of mindfulness-based cognitive therapy on severity of social anxiety and self-control people with social anxiety symptoms. The study was quasi-experimental with pretest -posttest and follow-up with experiential groups. The population consisted of all the students at Isfahan University, Iran. However, 30 students from this university were randomly placed into two groups namely experimental and control groups (15 students in each group). The used inventory in this research was: 1. Liebowitz Social Anxiety Scale (Liebowitz, 1987) and Self-control questionnaire (Tangney, 2005) . The results of MANOVA test showed that mindfulness-based cognitive-behavioral therapy in reducing severity of social anxiety and improvement of self-control and psychological flexibility is effective in patients with social anxiety symptoms (p <0.01). According to the results of this research, mindfulness-based cognitive-behavioral therapy is an effective way to improve the factors that can have an important role in improving social anxiety.