Abbasid caliphs have always used boon-companions in planning affairs, making policies and spending time. Boon-companions has been accompanied by caliphs at most of the court ceremonies especially feasts, and sometimes at consultation meetings and acted according to their skills, knowledge and abilities depending on the circumstances and the caliph’ s desire. The main question of the study is that how was boon-companions position and function in Abbasid court? This study by analyzing data and reports of the first-hand references has indicated that boon-companions sometimes had dominance over caliphs, and interfered in the affairs of the country by their views and suggestions. Moreover, due to the close relationships with caliphs, they were influential in social affairs according to the personality, adequacy and court’ s conditions. Similarly, in regard to economy, boon-companions due to their relationships and companionships by caliphs gained enormous wealth by receiving various gifts and tips and even high-ranking governmental positions and were among the properties of the court.