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In the airborne gamma-ray spectrometric survey, the NaI(Tl) crystal and photomultiplier circuit are easily affected by the changes of ambient temperature, which will result in non-linear peak drift in the number of channels. Thus, the circuit stabilization technology plays a significant role in ensuring the accuracy of airborne gamma-ray spectrometric data. The airborne gamma-rayspectrometric stabilization circuit is designed by controllingthe high voltage of photomultiplier tube to adjustthe signal gain and signal pulse superposition level to shift the pulse signal amplitude.The developed program controls the operation of the spectrum stabilization circuit to adjust the nonlinear peak drift caused by the change of ambient temperature, realizing the function of automatic spectrometric stabilization.According the experiments, the characteristic peak position controlled by the stabilization circuit is obvious, and the stabilization speed is fast.The maximum peak drift is less than 1.5 channels for 1024-channel full spectrum measurements, which meets the design requirements.