介绍对本实验室用于低水平放射性比活度测量的高纯锗能谱仪作效率刻度的方法，即先用１５２Ｅｕ点源作相对效率刻度，然后用一个体标准源把相对效率刻度曲线转换成绝对效率曲线．实验证明，只要点源与探测器有足够的距离则可避免符合相加修正．比对结果表明该方法是可行的 This paper introduces a method for efficiency calibration of high-purity germanium energy dispersive spectrometer used in this laboratory for measuring specific activity of low-level radioactivity by first using 152Eu point source as a relative efficiency scale and then converting the relative efficiency calibration curve into Absolute efficiency curve. Experiments show that, as long as the point source and the detector have enough distance can be avoided in line with the additive correction. Alignment results show that this method is feasible