Purpose: This study compares the functional outcome of arthroscopic and mini-open rotator cuff repair in patients who underwent repair of full thickness rotator cuff tear in various size tears between 2006 and 2013with minimum 2 years follow-up. Type of study: prospective case series. Method: All patients were assessed clinically and by using UCLA (University of California, Los Angeles) score and Oxford score both preoperative and postoperative after 2 years. Patients have been divided into 2 groups; one have tears <3>3cm. Exclusion criteria patients who had acromioclavicular arthritis, subscapularis tear, or instability. Repair was done using suture anchor. Results: Both UCLA and Oxford scores for both groups show significant improvement after 2 years with improvement in shoulder function but no difference between types of surgery with any tear size. Conclusion: There are improvement in both groups arthroscopic and arthroscopically assisted mini-open in both range of motion and scores of the shoulder, with no difference between two surgical methods. Level of Evidence: level III case comparative study.