Introduction and purpose: Paying attention to children's psychological, emotional, cognitive, psychological and attachment processes can provide the basis for reducing psychological harm. according to this the present study was conducted to investigate efficacy of positivist parenting method training on attachment quality in fifth-grade primary school female students. Methodology: It was q quasi-experimental study with pretest, posttest, control group, with control group design. Follow-up period was administered in two months too. The statistical population of the study included fifth-grade primary school female students with and their parents in the city of Tehran in academic year 2021-22. Twenty-seven students were selected through purposive sampling method and randomly accommodated into experimental and control groups (14 students in the experimental group and 13 in the control group). The experimental group received ten ninety-minute sessions of positivist parenting training during two and half months. The applied questionnaire in this study included children’, s Children's Attachment Questionnaire (Kappenberg, Halpern, 2007). The data from the study were analyzed through mixed ANOVA via SPSS23 software. Findings: The results showed that positivist parenting training has significant effect on the attachment quality of the fifth-grade primary school female students (p<0001, Eta=0. 67, F=50. 58). Conclusion: According to the findings of the study it can be concluded that positivist parenting training can be used as an appropriate method to improve attachment quality in female students through employing normal parenting methods and appropriate communication principles.