This research was conducted to study the effectiveness of education based on the cognition, meta-cognition, and behavioral model in reducing symptoms of social anxiety disorder (SAD). The study was a semi-experimental design with pretest-posttest design with control group. The study population was all patients with social anxiety disorder (SAD), that, referenced to private and public centers in Kermanshah in 2016, that by available sampling method, 30 patients from persons through structured interview (SCID-I) and social anxiety questionnaire of Connor et al (2000), were eligible for the study, selected and assigned to the experimental and control groups, randomly. Twelve sessions of cognition, meta-cognition, and behavioral treatment according to the model developed and based on theoretical perspectives was administered to experimental group as biweekly; while the control group did not receive the intervention. At the end of the intervention, both groups were evaluated again by the test of Connor et al (2000). The data were analyzed using analysis of covariance (ANCOVA).The findings showed that education based on the cognitive, meta-cognitive, and behavioral model was effective in reducing symptoms of social anxiety disorder (P<0.001). Therefore, according to effectiveness of the model on reducing symptoms of social anxiety disorder (SAD), it seems therapists and counselors can use the developed model to reduce the symptoms of social anxiety disorder (SAD) among patients.