A fast neutron detector using the EJ301 scintillator was manufactured for study on detecting fast neutrons and gamma-rays. Detector c-haracteristics include the energy linearity, the efficiency response and the neutron/gamma discrimination were guaranteed for neutron detection in the energy range f-rom 50 to 3000 keVee. The ability discrimination of neutrons/gamma-rays of the detector was evaluated by the c-harge comparison (CC) method using an 252Cf source. The total efficiencies when measured on 22Na, 137Cs, 60Co and 252Cf sources were obtained 17.8%, 3.9%, 9.8% and 14.8%, respectively. The Figure of Merit (FoM) values of CC method were 0.4–1.55 for the range of energy 50–1000 keVee (keV electron equivalent).