Abstract: The γ-rays from ⁶⁰Co radioactive source(about 2.2×10¹⁴ Bq) are transferred into a series of single-energy γ-rays by a Cu scattering target. With these single-energy γ-rays the sensitivitiy of YAP: Ce scintillator detector was studied. The results indicate that the γ-ray sensitivity of YAP: Ce scintillator is more than 10 times of that of CeF₃ scintillator with the same volume, and YAP: Ce scintillator could be regarded as an alternative solution for γ-ray detecting.