Abstract: Quality of life remains low for many patients after coronary heart surgery. The purpose of this study was to design and evaluate an educational program in the improvement of life quality in patients after coronary artery bypass graft (CABG) surgery. Materials and methods: In this experimental clinical-trial 110 patients were randomly devided into case and control groups six weeks after coronary artery bypass surgery. Planning of the educational programme was done according to PRECEDE-PROCEED Model. Before implementing the programme, life-quality questionnaires (Sf-36), self-designed questionnaires, and standard questionnaires-according to PRECEDE-PROCEED model- were filled out for both groups. The experimental group received the educational intervention, and the control group received only routine cardiac rehabilitation care. Both group members were followed up immediately and 4 weeks after intervention and the previous questionnaires were filled out for them again. Finally the obtained data was statistically analysed by means of SPSS using Chi-Square, t-test, and variance analysis test at the significant level P≤0.05. Results: Significant improvement was found in the following components of life quality in the cases after their participation in the educational program compared to the controls: physical functioning (P<0.001), physical role (P<0.05), bodily pain (P<0.01), general health (P<0.01), vitality (P<0.01), social functioning (P<0.05), mental role (P<0.01), and mental health (P<0.01). Conclusion: The findings suggest beneficial effects of educational intervention based on the PRECEDE-PROCEED Model on improving quality of life in patients after CABG.