The goal of this research is to employ meta-analysis to an integration of the results of the effects of Korean traditional music in domestic music therapy/activities, and to analyze comparatively the average of effect size for each variable which can influence therapeutic effects. For this, Subject was carried out from 2000-2012 using meta-analysis, focusing on 39 experimental research studies applying Korean traditional music as an independent variable, selected from over 39 music research-related Masters and Doctoral theses located in the National Assembly Library, the National Central Library and RISS. A Meta-analysis was performed by using the Effect size determination programs to transform the study result into effect size which is common measure. We yielded total 70 effect size from papers and used SPSS 13.0 for Window. The results indicated that the overall mean effect size was found to be 1.16, indicating that music therapy was highly effective in overall. Second, the subjects were classified according to the symptoms and signs of age. When they were compared by the symptoms, the effect size of general public was found to be most effective(ES=1.31). When they were compared by the clients’ age, the effect size of elementary school students were found to be most effective(ES=1.47). Third, when they were compared by their programs, effect size of music therapy programs including non-musical activities in every session was larger than the effect size of music activities. however, there was no statistically significant difference. Fourth, when they were compared by traditional musical variables, the effect size of the tune utilizing variables for the study was larger(ES=1.23) than the effect size of using folk songs most small(ES=0.66). Finally, when music therapy programs were compared by their dependent variable, programs focusing on social skills in clients were found to be most effective (ES=1.80), there was statistically significant differences.