The gamma response functions of EJ301(5cm in diameter and 20cm in height)organic liquid scintillator detectorwith standard 22 Na,60 Co and 137Cs gamma sources were measured in experiment.Standard gamma sources were mounted on the center of the entrance windowof a cylindrical(5cm in diameter and 20 The gamma response functions of EJ301 (5 cm in diameter and 20 cm in height) organic liquid scintillator detector with standard 22 Na, 60 Co and 137 Cs gamma sources were measured in experiment. Standard gamma sources were mounted on the center of the entrance window of a cylindrical in diameter and 20