Background and Purpose: Family function is an important aspect of family environment which affect physical, social and emotional health of the children. The function of families with children with oppositional defiant disorder may falter. The aim of the study was to compare the efficacy of child-parent relationship therapy (CPRT) and family-focused therapy (FFT) on function of families with children with oppositional defiant disorder (ODD).

Method:  Current study is an experimental research with pretest and posttest and control group. The population consisted of all families with children with oppositional defiant disorder who referred to counseling centers in Sanandaj in 2016. The sample consisted of 36 families who were selected using convenience sampling method and randomly assigned to one of the two experimental groups (treatment with CPRT, or treatment with FFT) or the control group. Data were collected using the measure of family functioning (Epstein, Baldwin and Bishop, 1983). The experimental group received a 10-session training course (2 hours/ per session), while the control group did not receive any training.

Results: According to the findings, both experimental groups showed significant improvement on family function comparing to control group. Furthermore, comparing to FFT therapy, CPRT therapy had a greater influence on the improvement of family function.

Conclusion: Using the two therapeutic methods discussed in this study is an important step toward improving the family function.