Abstract Introduction: There is often a gap between the abilities of the gifted individual and his or her actual accomplishments (under achievement). This disparity can result from various factors, such as loss of interest in classes, emotional or psychological factors, including depression, anxiety and perfectionism. All of these people share a common trait which is lack of academic motivation. Academic motivation is a desire to learn, liking learning-related activities, and believe that school is important. One of therapies which that deal with under achievement is solution-focused therapy. Solution-focused therapy or brief therapy, is a type of talking therapy that is focus on what clients want to achieve through therapy rather than on the problem(s) that made them seek help. Objective: The purpose of this study was to investigate the effectiveness of group counseling solution-focused brief therapy (SFBT) on academic motivation with under achievement Student’s among high school students in Tabadkan region at city of mashhad in the year of 1391. Method and materails: In an experimental study, subjects were selected from among high school students with under achievement. The subjects were randomly assigned to experimental and control group. Group counseling SFBT was administered to the experimental group in eight 90-minutes sessions. The control groups did not receive any therapy. Both two groups completed the academic motivation questionnaire (AMQ) after the intervention period. Data were analyzed using statistical test of covariance. Results: Analysis of covariance in post-test assessment showed significant difference between the experimental and control groups (p<0.05). In other words, academic motivation increased in the experimental group. Conclusion: group counseling solution-focused brief therapy is effective in increasing academic motivation of Students with under achievement.

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