To decrease CCD dark current noise and improve the signal to noise ratio in airborne ultraviolet imaging spectrograph, CCD working temperature should be decreased as CCD is temperature sensitive device. So CCD cooling circuit was designed by adoping analog PID algorithm, and its parameters were determined by Ziegler-Nicholas method. The max cooling rate is less than 5℃/min and its temperature stability is about ±0.05℃, satisfing the requirements of maximum cooling temperature difference.The cooling circuit has been tested on airborne system. The experimental results show that change of temeperature could not affect the cooling results. And after reaching the target refrigeration temperature of －20℃, dark background noise of spectral dimension CCD detector is 1 702 on average and dark signal response non-uniform decreases to 0.5%. The results meet the requirements of spectral data.