Abstract: InGaAs infrared array detectors, as the core devices for short-wave infrared measurements in space communication and remote sensing, are susceptible to degradation by space radiation, and the study of their radiation effects is a prerequisite for evaluating their reliability applications in space.The study of γ radiation effect was carried out on InGaAs detectors, and the changes of basic performance parameters such as DC level, response signal, blackbody response rate, peak response rate, blackbody detection rate, peak detection rate, noise, noise equivalent temperature difference(NETD), blackbody response non-uniformity, etc.were comparared before and after irradiation, and the changes of detector's operating current and output image were analyzed.It is shown that with the accumulation of γ radiation dose, the detection capability of the detector decreases and the performance degrades.The mechanism of the effect of γ radiation on the detector performance is analyzed, in order to provide support for the research on the anti-radiation reinforcement and space application of InGaAs detectors.