Purpose: The present study was conducted to investigate the 
effectiveness of dialectical behavior therapy on the difficulty 
of emotional regulation and aggression in female adolescents 
with depressive symptoms .
Materials and Methods:The research method of the present 
study was quasi-experimental with pretest, posttest and control 
group design and follow-up period in two months. The 
statistical population of the present study included female 
adolescents with depressive symptoms who referred to 
education counseling centers in Babol city in the academic 
year of 2021-2022. 30 female adolescent with depressive 
symptoms were selected through purposive sampling method 
and randomly accommodated into experimental and control 
groups (15 adolescent in the experimental group and 15 
adolescent in the control group). The experimental group 
received dialectical behavior therapy (10 sessions) during 10 
weeks (90 minutes). The applied questionnaires in this study 
included Adolescent Depression Questionnaire (Kutcher, 
2002), Difficulty in Emotion Regulation Questionnaire (Gratz 
& Roemer, 2004) and Aggression Questionnaire (Buss & 
Perry, 1992). The data were analyzed through mixed ANOVA 
and Bonferroni follow-up test via SPSS23 software .
Findings: The results showed that dialectical behavior therapy 
is effective on the difficulty of emotional regulation (F=42.50; 
Eta=0.60; p<0001) and aggression (F=31.83; Eta=0.53; 
p<0001) of female adolescents with depressive symptom .
Conclusion: According to the findings of the present study, 
dialectical behavior therapy can be used as an efficient method 
to decreace difficulty of emotional regulation and aggression 
of female adolescents with depressive disorder through 
employing techniques such as bearing distress ،emotional 
self-regulation ،mindfulness and effective communication