The purpose of this study was to investigate the effects of solution-focused group supervision (SFGS) on school counselors of senior high school. Twelve school counselors as supervisees participated in this study and received eight 3-hour sessions of SFGS. In each session of SFGS, two supervisees presented their real case in schools according to case report approach. All supervisees were interviewed individually about 1-2 hours after all SFGS. Each interview was transcribed  and analyzed by a qualitative research method. The effects of SFGS on these supervisees were able to generate helpfulness to counseling work, including accepting positive philosophy of solution-focused brief therapy and changing direction of intervention, mastering usage of solution-focused brief therapy, reducing the expert role of the counselor, overcoming difficulties of their counseling work and strengthening their abilities of case conceptualization, increasing counseling efficacy, and agreeing that solution-focused brief therapy was useful for working with adolescents. The SFGS was also found to be helpful in school consultation, other school counseling programs, and personal level on these supervisees. Finally, based on the results of this study, suggestions were provided as the guidance and references for SFGS, school counselors, and future studies in relative fields.